Tiger77 it must be your technique. I've flown between continentals in 310's and 402's for around 4500 hrs with never a hint of the problem you suggest.
However if it will make you happy I did see an ad recently for a 310 in the states with two 350hp chieftain engines in it. Supposedly good for around 240 knots.
Not sure if you'll be able to see this without a password, but here it is.
http://tappix.com/716718