Advice requested

[Pwrbomb1970]

I am having a bit of an issue with my Grendel AR. I’m getting ejector swipes and marks on the brass from loads that are way under max. I have a standard gas block and carbine spring and buffer. JP Enterprises enhanced bolt. Can I get some advice? I’m thinking of going to an adjustable gas block. Should I look into the spring/buffer combo too? If so what should I go after? Thanks in advance for any advice.