there are many folks with more knowledge than i have here, but there are a couple of things for you to consider.
1) what type of events will you be doing? throwing down 1,000 watts at the end of milan-san remo is different than 1,000w at the end of your 30-minute crit. (not such a silly comparison; i've done a 200-mile race that has come down to a sprint finish). sometimes people will look at results from a sprint workout and cherry pick the best result when they are fresh. what counts more is what you can come up with at the END of your event.
2) tactics and efficiency are huge. if your event and competition tax you so that you are riding at your limit all race, you'll be less likely to see a power peak at the end. conversely, if you are the jedi-master of hiding from the wind, you will be relatively more fresh.
3) you're not going to be the strongest guy in cat 3 or 4, but if you are compact and it is a flat sprint....IF that number is credible...you can be just fine. jump too early? take too much wind? not compact enough? start in the wrong gear? all will work against you.
it's very easy to focus on power (and it is a GREAT motivator for training), but it matters less than you can possibly imagine in many races at the levels you're describing. you can and will be beaten by less strong guys, but you also have the opportunity to beat those with better #s than you have.
up above i mentioned "if your #s are credible." not sure about the power tap, but many wireless meter/head combos continue to transmit the last reported power value for ~3 seconds. why does this matter? well, let's say you go all out for 12s then abruptly stop pedaling (not uncommon for a sprint workout). there's no data, so some units fill that in with the last reported value. adding 3s @ 1,150w to a 12s effort makes a huge difference.....IF one is focusing on numbers. you can check this by combing through your data.
if you are new to this, i would say you have some GREAT numbers to serve as a starting point, and you should not worry about limiters. in fact, don't dismiss any aspect of your training at this stage. continue to race, continue to train (great for you to train a weakness) and you will naturally see where you are getting your best results. if you can't win the cat 5 sprint then the # won't matter in cat 4, or 3, or...