>I don't believe fine/refine, call/recall, and
act/react work in the same way....

well, I didn't lump them together. in fact, the only one I suggested might fit the intensifier bill was refine, thusly:

fine: to make fine or pure; to purify from extraneous or impure matter
refine: to free from imperfections or defects; to bring to a more perfect state