So it's turning at around 5800 RPM, oops
I'll probably just try and set it as close to 4000 I can.
I'll probably just try and set it as close to 4000 I can.
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Thus my healthy fear of my jointer. Seriously, that thing freaks me out every time I turn it on. Could have something to do with my boss missing half his finger from one of these....The only safety measure it has is a guard...
I guess I should update for posterity.
It turns out most of the issues I'd mentioned were solved easily. I ended up taking @Bruce Johnson's suggestion of just drilling new holes and tapping. There was just enough meat beyond the outside screws to drill new holes there. Finding hex bolts that were around 1/4" long was actually a bit challenging, the biggest ones I could find were M5... so that's what I bought.
So it turns out the pulleys on the jointer were appropriately sized to run around 4000-4500 rpm. I did the math thinking the belt was riding at the bottom of the pulley instead of at the "pitch diameter".
And the co-planar table stuff turned out to be a bump in the infeed table. I flattened it out with a diamond plate, and all of a sudden the two tables are almost in perfect alignment.
I reinstalled the gibs and blades (what a fun process that is), and the whole thing works pretty well. I also matched the blades and gibs according to their weight (thanks again Bruce). I haven't changed the belt yet, but it seems to be spinning more quietly already. I was able to flatten out some mildly wavy birch without tear-out, so that's good enough for me.
Thanks for the help.