Corkscrews

Is there any certain speed or G-level that a corkscrew (or any other element for that matter) should be close to in order not to be "lethal"?  Corkscrews are giving me the most trouble, as they hit somewhere around 5 G's.  I wasn't sure if its the speed or just a sudden change in direction causing the high G's, but I believe a corkscrew shouldn't be anywhere near 5 G's.

As to the speed, it probably depends on the size of the corkscrew. The G-level I'm not sure about.

Yeah, that's kinda what I was going for.  The "standard" corkscrews always seem to max around 5 G's for me.  That can't be right.  I think my latest numbers are between 3 or 4, but I'm not sure why.