not bad advice from tom. unless u have a pyranha, packing stuff in front of the bulkhead is not really worth the effort. always pack the heaviest stuff and as much as you can right behind your seat. i've also seen people get creative with packing stuff between their legs and attached to the middle of the bulkhead. be careful with that though and make sure u can still exit easily.
and then also as tom hinted at, if you pack well in the stern it shouldn't really effect your paddling that much. i know many many great paddlers who've paddled the hardest multi-days on the planet who've never put anything up front. practice paddling your fav. difficult day run with a fully packed boat and you will get the hang of it. stay forward, follow through on all your strokes and let the boat carry its weight in the direction you want to go. i.e point it and drive it. i've found a fully loaded boat is more of a mental obstacle than a physical one.
Cub boater: "What do the spiders mean?" Old fart boater: "Trust your intuition." CRCII