For players who PM'ed me, here are the Pick 4 Sums with Box Combinations for May 2018, courtesy of https://www.lotterypost.com/charts/pick4/sums
"Quant" is the number of box combinations for each sum. I did not distinguish between mid and eve.
Sum Quant Box Combinations
0 1 0000
1 1 0001
2 2 0002, 0011
3 3 0003, 0012, 0111
4 5 0004, 0013, 0022, 0112, 1111
5 6 0005, 0014, 0023, 0113, 0122, 1112
6 9 0006, 0015, 0024, 0033, 0114, 0123, 0222, 1113, 1122
7 11 0007, 0016, 0025, 0034, 0115, 0124, 0133, 0223, 1114, 1123, 1222
8 15 0008, 0017, 0026, 0035, 0044, 0116, 0125, 0134, 0224, 0233, 1115, 1124, 1133, 1223, 2222
9 18 0009, 0018, 0027, 0036, 0045, 0117, 0126, 0135, 0144, 0225, 0234, 0333, 1116, 1125, 1134, 1224, 1233, 2223
10 22 0019, 0028, 0037, 0046, 0055, 0118, 0127, 0136, 0145, 0226, 0235, 0244, 0334, 1117, 1126, 1135, 1144, 1225, 1234,
1333, 2224, 2233
11 25 0029, 0038, 0047, 0056, 0119, 0128, 0137, 0146, 0155, 0227, 0236, 0245, 0335, 0344, 1118, 1127, 1136, 1145, 1226,
1235, 1244, 1334, 2225, 2234, 2333
12 30 0039, 0048, 0057, 0066, 0129, 0138, 0147, 0156, 0228, 0237, 0246, 0255, 0336, 0345, 0444, 1119, 1128, 1137, 1146,
1155, 1227, 1236, 1245, 1335, 1344, 2226, 2235, 2244, 2334, 3333
13 32 0049, 0058, 0067, 0139, 0148, 0157, 0166, 0229, 0238, 0247, 0256, 0337, 0346, 0355, 0445, 1129, 1138, 1147, 1156,
1228, 1237, 1246, 1255, 1336, 1345, 1444, 2227, 2236, 2245, 2335, 2344, 3334
14 36 0059, 0068, 0077, 0149, 0158, 0167, 0239, 0248, 0257, 0266, 0338, 0347, 0356, 0446, 0455, 1139, 1148, 1157, 1166,
1229, 1238, 1247, 1256, 1337, 1346, 1355, 1445, 2228, 2237, 2246, 2255, 2336, 2345, 2444, 3335, 3344
15 38 0069, 0078, 0159, 0168, 0177, 0249, 0258, 0267, 0339, 0348, 0357, 0366, 0447, 0456, 0555, 1149, 1158, 1167*, 1239,
1248, 1257, 1266, 1338, 1347, 1356, 1446, 1455, 2229, 2238, 2247, 2256, 2337, 2346, 2355, 2445, 3336, 3345, 3444
16 41 0079, 0088, 0169, 0178, 0259, 0268, 0277, 0349, 0358, 0367, 0448, 0457, 0466, 0556, 1159, 1168, 1177, 1249, 1258,
1267, 1339, 1348, 1357, 1366, 1447, 1456, 1555, 2239, 2248, 2257, 2266, 2338, 2347, 2356, 2446, 2455, 3337, 3346,
3355, 3445, 4444
17 41 0089, 0179, 0188, 0269, 0278, 0359, 0368, 0377, 0449, 0458, 0467, 0557, 0566, 1169, 1178, 1259, 1268, 1277, 1349,
1358, 1367, 1448, 1457, 1466, 1556, 2249, 2258, 2267, 2339, 2348, 2357, 2366, 2447, 2456, 2555, 3338, 3347, 3356,
3446, 3455, 4445
18 43 0099, 0189, 0279, 0288, 0369, 0378, 0459, 0468, 0477, 0558, 0567, 0666, 1179, 1188, 1269, 1278, 1359, 1368, 1377,
1449, 1458, 1467, 1557, 1566, 2259, 2268, 2277, 2349, 2358, 2367, 2448, 2457, 2466, 2556, 3339, 3348, 3357, 3366,
3447, 3456, 3555, 4446, 4455
19 41 0199, 0289, 0379, 0388, 0469, 0478, 0559, 0568, 0577, 0667, 1189, 1279, 1288, 1369, 1378, 1459, 1468, 1477, 1558,
1567, 1666, 2269, 2278, 2359, 2368, 2377, 2449, 2458, 2467, 2557, 2566, 3349, 3358, 3367, 3448, 3457, 3466, 3556,
4447, 4456, 4555
20 41 0299, 0389, 0479, 0488, 0569, 0578, 0668, 0677, 1199, 1289, 1379, 1388, 1469, 1478, 1559, 1568, 1577, 1667, 2279,
2288, 2369, 2378, 2459, 2468, 2477, 2558, 2567, 2666, 3359, 3368, 3377, 3449, 3458, 3467, 3557, 3566, 4448, 4457,
4466, 4556, 5555
21 38 0399, 0489, 0579, 0588, 0669, 0678, 0777, 1299, 1389, 1479, 1488, 1569, 1578, 1668, 1677, 2289, 2379, 2388, 2469,
2478, 2559, 2568, 2577, 2667, 3369, 3378, 3459, 3468, 3477, 3558, 3567, 3666, 4449, 4458, 4467, 4557, 4566, 5556
22 36 0499, 0589, 0679, 0688, 0778, 1399, 1489, 1579, 1588, 1669, 1678, 1777, 2299, 2389, 2479, 2488, 2569, 2578, 2668,
2677, 3379, 3388, 3469, 3478, 3559, 3568, 3577, 3667, 4459, 4468, 4477, 4558, 4567, 4666, 5557, 5566
23 32 0599, 0689, 0779, 0788, 1499, 1589, 1679, 1688, 1778, 2399, 2489, 2579, 2588, 2669, 2678, 2777, 3389, 3479, 3488,
3569, 3578, 3668, 3677, 4469, 4478, 4559, 4568, 4577, 4667, 5558, 5567, 5666
24 30 0699, 0789, 0888, 1599, 1689, 1779, 1788, 2499, 2589, 2679, 2688, 2778, 3399, 3489, 3579, 3588, 3669, 3678, 3777,
4479, 4488, 4569, 4578, 4668, 4677, 5559, 5568, 5577, 5667, 6666
25 25 0799, 0889, 1699, 1789, 1888, 2599, 2689, 2779, 2788, 3499, 3589, 3679, 3688, 3778, 4489, 4579, 4588, 4669, 4678,
4777, 5569, 5578, 5668, 5677, 6667
26 22 0899, 1799, 1889, 2699, 2789, 2888, 3599, 3689, 3779, 3788, 4499, 4589, 4679, 4688, 4778, 5579, 5588, 5669, 5678,
5777, 6668, 6677
27 18 0999, 1899, 2799, 2889, 3699, 3789, 3888, 4599, 4689, 4779, 4788, 5589, 5679, 5688, 5778, 6669, 6678, 6777
28 15 1999, 2899, 3799, 3889, 4699, 4789, 4888, 5599, 5689, 5779, 5788, 6679, 6688, 6778, 7777
29 11 2999, 3899, 4799, 4889, 5699, 5789, 5888, 6689, 6779, 6788, 7778
30 9 3999, 4899, 5799, 5889, 6699, 6789, 6888, 7779, 7788
31 6 4999, 5899, 6799, 6889, 7789, 7888
32 5 5999, 6899, 7799, 7889, 8888
33 3 6999, 7899, 8889
34 2 7999, 8899
35 1 8999
36 1 9999
Legend: *yellow highlight repeat within a month
Just select what you think is viable (please, don't play all).