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I know Lynn had the Norton combo 225/1000 and he mentioned in serious cases using the 225. I have used my 325 diamond plate for a really large chip removal. I now have a DMT 600 and if worse came to...

I think that it does yes. OTOH, the Naniwa will probably leave a shallower scratch pattern to smooth out when you go up in grit. Sort of pay me now or pay me later.

How about circles alternately with some back and forth strokes ? Use a bit more pressure than you normally would. Just check it often to see if you're getting anywhere.