therod It'd be, at most, a 6-10yd difference I suspect. Very difficult to see on the course, since you're likely to get that kind of variance missing the middle of the face by a quarter of an inch.
But hey, if you can consistently pick up a couple of yards, sweet! Can also move the weight forward for windy days to hit it a little lower.
At 270-280 you're already hitting it well, and I suspect you'd want the heavy weight forward all the time. It's not like the you'll be hitting knuckle balls in that configuration anyway.
I play the f7+ (heavy weight forward) at 9.5° with a PX Hzrdus Black 76g shaft, and I have never felt like I hit it low. Most good hits are 290-305. Fades don't get out of control either. Good high flight, seems like good spin no matter what shot I hit. Fades don't balloon, draws don't dive.