WHat hands are you getting all in pre with then against the fish. following range for fish is about 9%
http://www.pokerstrategy.com
Equity Win Tie
MP2 56.72% 55.99% 0.73% { QQ-TT }
MP3 43.28% 42.55% 0.73% { TT+, A7s+, A5s, KTs+, QTs+, JTs, AQo+, ATo }
so it will be profitable but high variance and you really should be questioning whether you should be staking off with JJ,TT preflop without having a good idea of what opponent is willing to stack off.
IF you are willing to stack off with tt-QQ pre then you have to accept that it is high variance and if you are willing to embrace that variance adjust your bet sizing to reflect that you don't want to stack off pre.
You' ll notice that my comments were with regards to 70% equity and not the lower equities that TT-QQ will have.