OP, you can stack all the above mentioned compounds w/2-andro...none are methylated so using 1-andro/2-andro/epi-andro/11-kt all together would not cause you any harm and is actually a pretty comprehensive hardening stack.
For simplicities sake though, a simple stack that i see alot of guys running and that appears to have alot of synergy would be:
2-andro @ 500mg/day
epi-andro @ 500mg/day
you have endless options with those compounds though, get creative...