Great to hear!
Yes, the first FW update had been scary for me, too, even more as I don't have any Windows available, so I had to do it using Wine. But it worked without issues.

The long calibration pulses in RA are sort-of normal if you calibrate on the target. Iris is at declination ~70, so the effective RA movement is only about a third of the nominal rate at the equator. So having to (at least) triple the pulse is expected.
With the non-legacy driver you should now be able to calibrate at meridian/equator and re-use the calibration.

For better analysis of guiding problems you'd probably have to upload a guide log. Maybe also an older one for comparison. The guide numbers you mention (IMHO) are not 'reasonable' (RMS is always positive; 0.11 sounds like a wrong focal length/image scale setting; the new values seem OK, depending on site quality and guide exposure time)

Read More...