You haveseveral things that are robbing your arrows of speed and energy. The wb is one. The ultra nock is another. Then there is the kisser. Each will take 2-5 fps - maybe even more -off your arrow speed, along with a corresponding loss of energy.

If your peep uses a rubber tube aligner, then there is another possible 5-10 fps. Then there is the aspect of using light carbon arrows. They don't absorb as much of the bow's energy as the 2315's you've gone to, usually a couple of foot pounds less.

Then thebow itself. The Nova S4 is a modified round wheel bow, so it doesn't produce as much speed and energy as a hard cam bow. 28" draw doesn't produce the energy of a 30" draw.

Individually, those things aren't too bad but taken all together... So, look at the entire system.

You can't do anything about your draw length, so you just have to live with it. The bow isn't churning out massive gobs of KE, so you have to do some things to maximize amount of energy it can put into your arrows.

Even though I'm no fan of the wb, there is no need to change your arrow rest... especially since you obviously think it's advantage offsets any performance shortcomings. Just so long as you've made an informed decision, I'm happy if you are.

I think you've made a very goodchoice in going to heavier arrows, although I think the 2315's will be a bit overspined. But since you're using a release, that might not matter too much. The 2315's will carry more energy from the bow and a lot more momentum. I'm a strong believer in momentum, most especially with lower KE rigs.

Get rid of some string weight. I'd suggest getting rid of the ultra nock and going to a string loop instead. Or, with a 38" axle to axle bow, just take it off and hook directly to the string using a brass nock and a cushion button. Save more weight by tying on a nockset instead of using the brass one.

Ditch the kisser. The peep is the only anchor point reference you need on the string. The kisser is redundant and a waste of energy.

If you've got the rubber tube peep, get rid of it and go with a smaller, lighter peep. Another thing about the rubber tubing is the noise it makes on the shot, and your setup is obviously making noise if that doe ducked your arrow so easily. I always liked the hunter size Fletcher Tru-peep, and also had good results with the Shurz-a-peep 2X2.

I think Muzzy has two major advantages over the T'heads. For one, their blade containment system is much better. The other is the trocar tip. T'headsuse a punch thru tip. With that Muzzy trocar tip, you can flat stone those facets to make the edges razor sharp. That makes Muzzy, in effect, a full cut-on-contact head for better penetration.