I shoot 50# @ 27" hybrid bow,cut to center(with strike plate),I use 400 spine cut at 29.2" with 50 grs insert + 180 grs point, so I think the 600 spine is not to stiff for me.
When I receive my new bow,I shooting left too,after checking the arrow spine,the limbs,the arrow rest/strike plate, the grip.....and after try differents hand placement on the grip....nothing, I allways shooting left.
After spend two days to try to shoot straight I finaly find the problem,that was just my form (shoulders misalignement).
My (old ) form worked good for me with my other bow but not with the new one.