Of losing 100, 200 units of bank spreading 1-20 on a 6 deck 75% pen. Typical rules.

1-2 unit min at 0
2unit at 1
4unit at 2
8unit at 3
20unit at 4

What are my results within 1 SD?? How much risk do I reduce if I spread 1-15 instead, cap 15 at +4?

How much ev do I reduce??

Thanks in advance to the experts.