That's a good value vs. RR. I think you'll find the treads a fine addtion to the Sat. Plus, the 51 psi certified max PSI is an added assurance.
As for the circumference, an adjustment to the SG may be necessary -- not a big deal. I usually have mine set to the most pessimistic settings so I try harder. The displayed FE prompts additional effort if it's perceived as low. The trick is to disregard the setting and shoot for that higher goal. Hopefully, I'll have 2 record tanks through this and lower cruise speed.
Let us know how the new tires work out!
RH77