I didn't do the math, but the important thing to realize is that parlays are the way to go IF you have 60% winners at normal odds....getting to 60% is the nearly impossible part. If you have some minor subset of bets that you feel will hit 60% + over time, and you can parlay them, then do it !
The higher your win % is, the more you should want to parlay....IF that win % is sustainable and not just some 60-40 streak.
If you could actually hit 70% ( nobody can against -110 lines) you should be betting all kinds of round robin parlays ( maybe 3 teamers) at proper risk amounts, and never bet straight.
at 100% winners, bet all ten team parlays ( in theory)....but you'd run out of books real fast....there are only a handful left now for Gringos.