One thing nobody has touched on is the condition of your mast rotation stops.

I've noticed that as my boat ages (and it's only 6 years old), it can't point as high as it used to, even though I've got a brand new jib. Newer boats point higher. Two things I can point to: the mainsail is feeling its age (will be replaced before North Americans) and the mast rotation stops are worn (will wait this one out, since mast rotation controls will be class legal next year).

Could also be that the frame isn't a rigid as it used to be, but it's still pretty stiff.

An over-rotated mast will not help you point.