Fx impact mk2 c1 loose

Hi

I upgraded my mk2 to m3 plenum and when i was going to screw there c1 i was able to screw it in to 5mm by hand and when it was at 6 to 6.5mm it was really loose.
When I had the mk2 plenum I had the c1 at 6.2mm, so now i took loctit and set it at the same distance.
anyone who had c1 as loose as mine? because it feels a little wrong to be able to screw it on so easily.