Mark, would be surprised if your TIP is collapsing on a non mapped car, also there is no drop in MAF reading to correspond with this supposed TIP collapse.
I use OEM NGK Platinum plugs on my stage 2 LCR with no CF's.
My advise would be to change your fuel to Shells and change your plugs to the above and relog.
CF's on an OEM mapped car points to issues tat need sorted out