Dirty,

Your distances are ok. Try a different ball and you may find a brand that gives you 10-15 yards extra. If you add a little width to your swing you will get a bit of distance there as well, but dont obsess about it. At 245 with the driver even a 450 yard par 4 is still well in reach for you. Concentrate on accuracy as well. If you chip and putt well (no restriction on how well you can do either of those) then your distance will matter much less.

D.