I like my 7 column stacks. I look at the stacks for each digit in column 7 to help pick the numbers.
I like 7 draw cycles.
When you have a stack of columns the new number that is entered in column 1 will shift all the columns so the numbers will stay over top of each other without no change in the numbers in the columns I will do one for you. I will enter 0000 in key number 0 column 1

KeyNumbers:
 0 26 31.0%
__1___2____3___4____5___6____7_
0000 9304 0026 0825 0614 2920 0015
0166 0347 7108 0715 4055 5770 6905
9902 7908 5860 2140 3048 7590 0169
9408 0344 4706 5680 6200 8104 
_________________________________
 0 26 31.0%
9304 0026 0825 0614 2920 0015 0166
0347 7108 0715 4055 5770 6905 9902
7908 5860 2140 3048 7590 0169 9408
0344 4706 5680 6200 8104

Mid draws Inspector 3 key numbers

Key Numbers:
 0 26 31.0%
9304 0026 0825 0614 2920 0015 0166
0347 7108 0715 4055 5770 6905 9902
7908 5860 2140 3048 7590 0169 9408
0344 4706 5680 6200 8104

 1 34 40.5%
4413 1651 5621 1484 0614 0015 0166
1642 9918 7127 7108 0715 1766 1616
3631 8341 5941 1817 5919 2140 5991
2261 1264 5147 0169 9912 1851 1984
4391 3631 5196 5125 2941 8104
 
 2 32 38.1%
5372 0026 0825 5621 9382 6582 2288
2920 4224 2455 9279 8298 1642 8827
7127 9927 7829 9262 3239 2675 6472
9902 2140 2261 1264 2357 2372 9912
3296 5125 2941 6200
 
 3 18 21.4%
4413 5372 9304 9382 0347 4353 3239
5773 3631 8341 4843 3048 2357 2372
0344 4391 3631 3296
 
 4 32 38.1%
4413 9304 7466 5479 1484 6455 0614
4224 2455 5745 0347 1642 4353 4055
9649 4677 6472 8341 5941 4843 2140
3048 1264 5147 4667 9408 0344 1984
4706 4391 2941 8104
 
 5 30 35.7%
1651 5372 5479 0825 5621 6455 6596
6582 2455 0015 5745 4353 0715 4055
5773 2675 5770 6905 5941 5919 5860
5991 7590 2357 5147 1851 7587 5680
5196 5125
 
 6 32 38.1%
1651 0026 7466 5621 6455 6596 6582
0614 6798 0166 9678 1642 9262 1766
9649 2675 4677 6472 6905 1616 3631
5860 2261 1264 4667 0169 4706 5680
3631 3296 5196 6200
 
 7 29 34.5%
5372 7466 5479 6798 9279 5745 9678
0347 8827 7127 9927 7108 7829 0715
1766 5773 2675 4677 5770 6472 7908
1817 7590 2357 5147 2372 4667 7587
4706

 8 24 28.6%
0825 1484 9382 6582 2288 6798 8298
9678 9918 8827 7108 7829 8341 7908
1817 4843 5860 3048 9408 1851 7587
1984 5680 8104
 
 9 30 35.7%
9304 5479 9382 6596 6798 2920 9279
8298 9678 9918 9927 7829 9262 3239
9649 6905 5941 9902 7908 5919 5991
7590 0169 9408 9912 1984 4391 3296
5196 2941