I believe the 3695 doesn't have the 42k limit but its wise not to run a BL motor much higher than that. 30-40k RPM is the most efficient range for most motors.
Also, the BK controllers don't run well with 4 Pole motors like the NEU motors.
You would be beter off running a Lehner 1950 with a BK esc.
I am still waiting for my MGM 12032 to arrive so I can try 8S out with my 12XL. The MGM should arrive soon.