EPtS starts a 15 second cooldown on EPtW (and vice versa, and the same for all the EPtX abilities) so in principle DCEs with EPtS and EPtW can keep both up nonstop, however it's not as reliable as 2 copies of each, and you'll definitely want to stack 2 or 3 of the DCEs.
For this build, you can run more Projectile Weapons or Shield Distribution doffs, whichever you like. You could also run a pair of TT cooldown reduction Conn Officers of good quality (1 purple 1 blue is I believe idea), allowing you to drop a TT and maintain maximum uptime on it. Then you could move a Spread down into the ensign slot, and a CSV into Lt, giving you room for another attack pattern, either a second APO or an APB (definitely APB if you're mainly doing PvE).
Last thing, try to pick up a Zero Point Energy Conduit from Rom rep, that gives a major boost to crit chance, and also think about a KCB and/or Omega Torp, the 2 piece bonus from that set is very nice for everything except the Vesta, and they're solid weapons.
Thanks for the reply. I need to learn more about this 2 piece kit. Only just unlocked tier 1 on rep system as had a break from the game. Should I keep with the maco xii set? I have the maco, omega and borg. Had thought about the borg eng and def with maco shield for the hull regen bonus.
I have MACO Mk XII on one toon and MACO shield with 2 piece Borg on the other. Both are decent, my feeling is that which is best depends to a large degree on how many heals you have. With enough heals, the higher cap from full MACO is better, and the energy regen is nice too. If you're short on hull heals the 2 piece Borg can help with that. I have no idea where the line is between the two is, however. If you don't have the Borg stuff already I wouldn't get it unless you really like throwing away money, if you already have the gear, try it out and see what you like. Of course, there are also the Elite Fleet shields to be considered, my fleet can't get them yet, but from everything I hear they're excellent, and could be combined with a 2 piece of either of the sets.