I noted that above ;^)

My previous car had inadequate rebound damping from new, so I swapped in some Bilsteins before it even had its first service. The car before that had noticeably worn struts by 40K miles, although they were not of the same quality. I'm hardly going to park the car as undriveable, I was just making an observation. When speeds go beyond reasonable, I've noticed a change. Perhaps it's my estimation of what's reasonable that's in need of adjustment.

 

Even though I think my car handles better on forged rims, it does skitter a little being pushed in a bumpy corner which I guessed was because the lighter wheel is more prone to bouncing.

 

Yeah that is a thing - your lighter wheels now react to the road surface significantly faster. It is a good thing, but your dampers are tuned for stock wheels weights. Heavy stock rims can have a damping effect on bumps, and rebound/compression stiffness and curves are probably set up to manage heavy wheels vs light forged wheels. If you have adjustable suspension, it might be worthwhile trying running comfort vs sport suspension settings and see what feels better. In theory, comfort damping may now be enough to manage the motion of the lighter wheels without such a stiff chatter feeling. Just a theory though, I plan on testing this myself once I switch to lighter rims - there's a lot more going on than just "comfort vs sport", but might be worth trying. Ultimately, for those of us making significant changes to our suspensions (weight, ride height, spring rates) getting two way adjustable coilovers is the best way to dial in comfort + handling correctly. You can even get custom valving. It all starts adding up $$$ though...

 

Maybe that's from the reduced sidewall?