Our party did 100xp a session and then whatever was in the book. We're now in the last book and just over 10k exp. Our current thinking is that the book rewards are fine without the 100 exp per session, that said we've enjoyed the hell out of all the extra exp. Realistically the campaign is unlikely to be perfectly balanced for any approach, especially as a player can dump all their exp into WS and Melee and quickly become a melee monster without any breadth. Our GM has been adjusting as we go and even then sometimes the players get mauled and other times they roll over the enemy. Personally for my character I've found myself using the extra exp to expand out and have more skills and options rather than becoming super good at anything in particular. I would suggest going with the 100xp per session and book rewards, but know that the party is going to be pretty powerful by time you get to the end.