I’ve got some uncertainties regarding nash push-fold chart. I understand that there is math behind shoving ranges but sometimes I just dont feel like pushing 14 bigs with K7s and 5 players behind or T5o with 10 bigs from the SB against a station. Moreover, I want to snap-fold 33 with 13 bigs UTG in full table. By sticking to nash I’ve been busting many tourneys often in spots where I don’t feel like shoving but nash tells me otherwise so I shove and bust.
1) How strictly we should stick to nash and how much it is based on player types and stacks behind?
2) How does the speed of the tournament influence our decisions regarding push-fold other than that in turbos we can’t always wait for a really good opportunity so we must often make higher variance plays?
3) 6max or full ring, no difference?

Thank you.