I use Rodinal for just about everything - I do lith prints and love how the lith just sort of bonds with those negs. Even HP5+ comes out very smooth tonally.
My development:
Pre-wash with 18°c water; Mainly to get the tank and film to temp. Rollei IR does specifically need a pre-wash, some films don't, I just pre-wash everything, and yes, I'd read the 30-page APUG prewash fistfight...
1+50 or 1+60 for most shadow detail and minimal grain, as strong as 1+25 when I want the lower mids to get a more "punchy" look - hard to describe, but the curve definitely changes. Stronger dilutions bring more grain (I've tested, believe me). For pinhole images, 1+60 since I find the highlights really go off with my pinhole.
Rodinal with distilled at 18°c; Agitate first 30, then 5 seconds each minute, agitate last 20, and pour for final 10. (I don't know if temp makes a grain difference - the difference as I tested between 20 and 22° was not noticeable to me. I dev at 18°c because it turns out my thermometer reads 2° hot, and all my testing notes are based on that, years of data!)
MY AGITATION: sort of like swirling a wine glass, very gentle. No inverting, just gentle wrist motion with maybe a 30° angle to the tank. I do fill the tank and I use a little piece of PVC pipe to press the reel down so it can't slide up and down. I just want to get fresh developer to the film.
Stop: 18°c distilled water, no agitation, 60 seconds. I picked this up from various old-timers who said with a compensating developer, the trace amounts of developer will eke out a bit more shadow detail. Never done an A-B test of this, every time I develop I think "I should really test this sometime". Rinse, fix, etc.
By the way, your fixing worries me, 3 minutes with one ag. per minute. You should constantly agitate for at least the minimum time it takes to clear a scrap of leader, and fix for 2-3 times that tested time, with several ags. per additional minute. I really "scrub" the film with the fixer. Look how little space is between the coils of film on the roll - it's a different ballgame than a piece of leader floating in a dish of fix. You can't over-fix (reasonably speaking), but you sure can under-fix.
I do use hypo clear on all my non-test rolls (sodium sulfite is cheap, my time ain't), and test every roll for adequate fixing and residual hypo.