2cm in bike fit terms can be considered an 'extreme change'. For me 2cm was the difference between a lot of discomfort and no discomfort at all but that was going the other way. Nobody can really say for sure whether or not you will be more comfortable or not in your case without more information.

I doubt 2cm will make a massive difference to the handling of the bike. Sure maybe it will feel slightly different but its hardly going to be unrideable as opposed to rideable. In fact, I've seen 11cm cited as being the 'optimal length' in terms as having a good balance of weight distribution and handling etc.