"The Bell 47 was an example of a manufacturer dealing with this issue.
They were modified by the addition of a controllable elevator coupled to the fore and aft cyclic.
I seem to recollect that post mod there was an increase in max forward speed in the order of 5-10 mph?"
It also made a difference to cabin load increaseespecially in the 3B1 etc. A Nobar 3B1 then also became a lot of fun on feral animal ops.
A problem these days is that there is an STC for a fixed elevator on the 47G and the angle of incidence has to be manually changed for external loads such as cargo rack and hook - and some pilots don't remember to read their POH as well as they should!
FlingW47 - If I recall - Far 27 certified machines such as the Robinson 22/44/66 etc VNE is a speed determined by a cyclic stick plot which allows enough cyclic to bring the nose back to level flight at most rear C of G should the machine encounter a wind gust of 15 kts or so (not sure of the actual figure) at the established VNE.