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I don't have a good answer but some thoughts, you've probably investigated already.
Assuming you need features at or below 70 is there a problem exceeding saturation if that region isn't needed?
Have you tried a hood/mask to try to ensure the first glass element in the scope is only being touched by photons direct from the sun as best as possible?
What about adding a planetary or similar filter to cut down the saturated wavelengths allowing you to boost the ones you need?
I don't know if temperature has much effect for solar but with my 120MC I added a stickon heatsink from jaycar (maybe four of them, havent used it in ages). Not much but when I first tested i got only a degree cooler sensor but more noticable was temperature fluctuation was smoother. May not help much but then you are maximising your setup.
Lastly using Region Of Interest cropping in FC can get you a better frame rate. With graphics formats making changes by powers of two is often most efficient. When I was after fastest frame rates I started with something like 480x480 then reducing this in increments of 16 pixels. Depending on target drift and how much post cropping I anticipated. So if, off the top of my head, you are capturing sunspot spectra this approach may help you with frame rate flexibility while pushing exposure settings.
16bit mode should give you more signal to play with (only 10 or 12bit vs 8bit). Are you losing the extra few bits in post processing steps before measuring?
Anyway these are approaches I'd try, maybe they'll help you with your specific process.
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