Does anyone know if there is better software for this? I believe i will have to pay for Oracle soon :/
Can anyone give me a rough idea if it'll be better to have

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here? I'll get off my arse at some point but if people know...
Pokerstove does this for you.
6s5s is the best hand to have against a realistic calling range for villain of two pair+, NFD (which is also TP of course) and combo draws.
Board:

equity win tie pots won pots tied
Hand 0: 79.750% 76.66% 03.09% 13661 550.50 { TT, 77, ATs, As9s, Ac8c, As8s, As4s, As3s, As2s, QsJs, Ts9s, T7s, 9s8s, ATo }
Hand 1: 20.250% 17.16% 03.09% 3058 550.50 { As8d }
Board:

equity win tie pots won pots tied
Hand 0: 74.998% 74.91% 00.09% 19282 22.50 { TT, 77, ATs, As9s, Ac8c, As8s, As4s, As3s, As2s, QsJs, Ts9s, T7s, 9s8s, ATo }
Hand 1: 25.002% 24.91% 00.09% 6413 22.50 { 6s5s }
Board:

equity win tie pots won pots tied
Hand 0: 79.361% 79.29% 00.08% 20408 19.50 { TT, 77, ATs, As9s, Ac8c, As8s, As4s, As3s, As2s, QsJs, Ts9s, T7s, 9s8s, ATo }
Hand 1: 20.639% 20.56% 00.08% 5293 19.50 { KsJh }
Obviously if villain will fold some of his combo FD/SDs to your big overbet (he should do so, but very few live players will fold here) then you do even better with the 6s5s since his calling range has you dominated a little less often.
Note that the above results only show which hand you would sooner have WHEN CALLED. It does not take into account how the different hands you can have
reduce the chances of you being called - i.e. through the blocker effect. If you have As8d it reduces the number of combinations of AT that villain can have and thus means that your shove will succeed a greater percentage of the time (although when he does call you are in much worse shape than if you had the 6s5s).
Edited to say: Just noticed that you specified he cannot have TT in his range because he 3bets it preflop 100% of the time, and that he will never have T7s in his range either. You can use pokerstove yourself to do the same sim as I did above, but remove TT and T7s from his range. The results will change a little bit but not
too much.