Have you tried to increase those 30MB? To something like 256? (That's what I have). Anyways, those .rpp-undos have always been a pain for me, I always found them problematic (and I've tried to use them from time to time since I started using REAPER 4 years ago). Saves are slow as hell if I enable them, it's always been like that and that's why I don't use that feature.
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Pressure is what turns coal into diamonds - Michael a.k.a. Runaway
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