Your going to get differing opinions on this. Its a support mod, so many people feel you should not do it unless absolutely necessary.
Me personally, I would check the idc and if it is over 90% I would upgrade the injectors and pump. My feeling is if you going to spend thousands on parts .. why not spend an extra 500 or so to ensure your fuel system is up to snuff.
You will likely be around 95% at stage 2 with a tmic .. some have even reported being at 95 with just a stage 2 ots map. I suspect it is one of the reasons we see so many pistons popping on stage 2 cars ... But that's purely my own speculation.