Need more pics of your parts. Engagement hole in the spring? them could wear out according to my manual.
And the clutch lever behind the transmission? those do bend. Someone may just have taken up all the adjustments to keep that bike rolling and then bent it.Clutch sure looked....abused.
I could see my lever flex by eye, had to reinforce it sticking a piece of alu pipe over it.
135....does sound weak. Yes also did the heel dance on mine, no way I can flatten it. But I am only 170 with the winter gear on.
Flunked all that to ride & wrench way back then.
The near new "medical" scale from the Salvation Army. $3.99....I am cheap.