Thanks Jim/Ben. The eos ra has no IR filter so let's in more red hydrogen light amongst other things. The liveview is really bright as well so no problem finding stars and could even see the nebula in the liveview quite clearly and at 30x magnification!
I was having real problems with my star tracker tho. It's used and seen better days and very prone to stick and judder so wasting alot of shots. I was stuck using 15sec exposures before clouds rolled in but was only a test so happy enough