What happens if your buffer is too heavy? Is there any detriment to this? What could happen?

H1 is 3.8oz
H2 is 4.6oz
H3 is 5.4oz

(approximately)

All other things considered if your buffer is too light I know what can happen, but if it's too heavy? What would my symptoms be?

I am running an H2 now with an XP spring. I see a buffer though that has a slightly heavier weight (4.9oz) and I am not sure if that little .3 oz would make a half a difference or not. I am guessing not so much.

But just in theory if I had too heavy of a buffer what would the gun act like?

Thanks!