I spotted a Taurean fan here
If you don't like atma, you may as well go with GMB and get the final 10IAS from the belt with nosferatu and max pierce, you will not get to 100% pierce but you will still have a nice % and a harder hitting bow.
Other than that everything is fine, you want pride cuz you are using atma and you don't want decrepy to erase your amp, you want atma tho in p8 games and your merc is going to be useless anyway, without teleport to move your merc and you inmense range you will be killing (almost) everything before the merc has the chance to go and procs decrepy in lower players games and is a choice between getting atma and proc yourself or getting reaper and try to make your merc to proc in p8 games, I prefer atma myself without enigma but it's your choice.
If you end up going with atma and pride merc, just get coh + andariel for the +4 skills to the might aura, you should avoid bosses anyway as bowazon so the CB on the merc is not really neccesary.