First layer issues on larger prints only

I am having issues on first layer with large prints - usually the second half or so

VC4 500 IDEX - Ti Tube - Latest RatOS - 0.5 Undertaker TC Nozzle

Helge's beacon guide followed and beacon compensation enabled

I will attach pictures of the failures, immediately after this issue on the large print, I put the first layer test print in the exact spot the large print had started failing and the first layer rectangle test print finished and looked great. I can also fill the bed with smaller objects and they generally print fine. Bed was cleaned with 91% iso before this print

If anyone has any ideas Id appreciate it