Yup, ain't no way that's anywhere near 10:1 unless the chambers are 54 cc's and they are not. That's why I said you can't do the math from a catalog. You need to actually measure the stuff and THEN do the math. Catalogs, like people can be wrong. Or they just lie.
I'd almost promise you the cam isn't where the cam card calls for, and since you are down on CR (my guess is with that cam if I did the engine you be at a MEASURED 10.5-10.8:1 and it would still run on pump gas but I want to see all the numbers first) I'd bet you need to be at a minimum of 6 degrees advanced from the LSA. For a start. It may want more advance with the low CR and no gear.