Yep, very common with LS cams as the exhaust ports are a bit more restrictive than intake. Hence either more duration to even out airflow. Stall issues with that cam are 100% tune related as it's very small. If you're looking for bang for buck or to correct low lift (that is fairly low for aftermarket) why not try a set of 1.8 ratio rockers? Would move it to .560"/.580" of lift and should give you some more punch for minimal $$ outlay.