Now this may help the op as well... but when you split up a comp set of lets say 60 rms per side... you should send 30 to the mid and 30 to the tweet correct?
Usually you put more to the mid than the tweet in an active setup. Tweeters are more sensitive, so putting the same power to both....the tweeter will be louder. Some passive x-overs have tweeter attenuation for this reason of -3 or -6 db.
All things equal, going from 80 watts to 100 watts RMS isn't going to be that big of a deal and will barely noticeable, if at all. In all honesty, I'd be more worried about over powering the tweeters in your case versus under powering the mids.