Remember, you are huge! You would tend to load a motor up and get it making heat way quicker. Definitely possible it ran "fine" with CPI, but how did it run with anything else?
The differences between small bore and big bore when it comes to shearers and CPI are vast. Especially since even the big bore CPI's are even aimed at producing a bit more torque, where as the shearers tend to really thrive on RPM's.
And if some one has a stock stroke stock cyl that "rips" on big bore shearers.... Wait till you see it run how it should. (Exceptions given when creativity meets welding or epoxy)
You meet so many guys who feel that because something goes through all 6 gears and beat their buddy's whatever blah blah bike, it must run good. Then they finally swing a leg over a real monster and suddenly everything they knew is changed.