Thanks for the advice.
One other thing, does anyone have an idea of what kind of wattage a competitive cyclist puts out in a cat 4/5 for the final 30s? I usually average 750-800 watts max for my final sprint, and I always get beat so I'm assuming this is kind of low. I also just start to sprint when I see the other guys sprinting, is there an ideal time slot (like 20s before the finish line?) when you should apply maximum power (your anaerobic capacity)?
My advice: Don't think about it and just race. If you get into the mentality that you "need" to be able to push a certain number just to compete - you've already lost the race.
750-800w for 30s is really impressive. I'm a cat 3 and my peak 30s is only 660w (I weigh 66kg) yet I was able to win many races as a 4. That kind of number should net you wins fairly easily if you live in a flat part of the world. I think the issue is your positioning leading into the sprint. My experience is that there will likely be one of two situations: (1) Everybody stays together and it becomes a field sprint or (2) Someone tries a flier and they either go alone or a select group is able to follow. If (2) happens, try to get into 2nd or 3rd wheel and just wait until you see an opening. This usually will happen 200-300m from the finish line, and you need to jump as hard as you can and push to the line.
I would suggest trying a flier next race and seeing how that goes. Try to find a spot that can allow you to jump hard and get away, a turn leading into the finishing straight is a great spot for this.