try a wider grip. takes stress off arms and puts more emphasis on chest. recently i've been doing almost exclusively wide grip and i've been getting some pretty good results.
This can also be useful! Be very careful though about this:
http://www.exrx.net/Kinesiology/Errors.html#anchor2174611yeah im using dumbells aha
and also uhh i think i was gripping too tightly cus every time i do chest presses with dumbells , when i finish there are nail bites in my hands where im sqeezing so hard my nails are gonig around the bar and into my hand.
Il try this out next week or so, without gripping so hard.
By the way what would you recomend i do to stop gripping so hard? I find it hard not to.