Okay i have a built 2001 gs it has:

Cold air intake
crower cams stage 1
aem cam gears
header
je pistons 10.5 to 1
bored out .30 over stock
jet performance computer
Stock valves and valve springs
stock rods and crank

I am wondering if the higher compression will cause major valve chatter around 20 to 40 mph or could the computer that Jet programmed be advancing the timing causing the chatter.. Do i need vavle spring and retainers? I need help

thanks