If you’re happy with your feeds and speeds and the results/finish you’re getting versus cutting time, then by all means keep them, experience is king. On my side I felt like with those settings you seem to be close to the lower limit where rubbing could happen, so I’m still curious whether you get any hint of burnishing on the edges ?
The discussion above seems to indicate that you could push feedrate quite a bit (probably x2 or x3) and still be fine, maybe just try that on a sample cut and see what happens. I would not increase DOC by much if I were you, slotting is hard and 40% of the endmill diameter is in the comfort zone. But @gmack would probably recommend using a DOC up to 100% of the diameter, and that may very well work out fine too at those high RPMs.