It's hard to work a beam overload build + pure sci, as you're going to have to choose between either (near) max aux or max weps power.
Also, THY1, THY2? THY1 isn't that good, really; but, more importantly, if you're going to be using a second tact boff, the ensign slot should really just contain 'the other' TT1. Save yourself 2 doffs in the process.
Also, ET1 on ensign eng? You have no EPtS at all! A bold choice!
using only one TT and 2 purple conn officers I gain one ability
and actually I do not need EPtS, TSS is good enough and I have a high shield's regeneration rate... May be in pvp I have to change something, but I use my sci toon in pve only.
at the moment that build is good for elite stf but it is not the final one... I have some ideas to try.