Hello, nice work there but I think your equations may be flawed. The part which calculates the positive effects(buffs) of each Venom is correct but the part that calculates the negative effects(debuffs) of each Venom is not.
It should be (LZ-DT) and not (DT-LZ) simply because Damage Taken is a debuff and not a buff. The way you calculate it right now is like it is a buff.
Also Venom lvl2
total effectiveness includes Venom lvl1 buffs as well, and Venom lvl3
total effectiveness includes Venom lvl1 and Venom lvl2 buffs. This way we take into consideration the total buffs of each Venom and not only the marginal ones.To explain this in a simple way: in order to cause Venom lvl2 debuffs you must first go to Venom lvl1, exploit its buffs for 8 seconds, then go to lvl2, exploit its buffs for 7 seconds and then if u decide not to go to lvl3 Venom, Venom lvl2 debuffs will be caused. Of course the same applies for Venom lvl3.
So with that in mind here is the
total effectiveness of all 3 Venoms for patch 1.0.3:
TVE = Total Venom Effectiveness
Of course there is one more thing; the fact that Venoms gives special armor properties to Bane's special attacks. This parameter is very hard to be calculated and inserted into the equation because it varies from matchup to matchup(it can be calculated but it requires a lot of work).