Is the cam timing the problem, or something else?

What's the bottom end made of?

You said you have 125-135lbs cyl at cranking?

Put 4 degree more advance, maybe 6.
You want 150lbs 'or more'..like at the least. No matter how small the cam is.

That's why you aren't turning tires.
As soon as you saw 125-135... you knew it!

Fix it.