Hi Marc, I have an extra Mantis 1.2 L deep sump for $400 (I bought to compare with my 2L LN deep sump but then I lost my enthusiasm for tinkering

) that barely hangs down any further than the OEM oil pan bottom, you may be able to stack that with your .5 extension to get 1.2L + .5 of extra oil (or replace the .5 spacer), and then run the oil around halfway between the high and low tick marks on the digital gauge. I run the 2L LN deep sump and run my oil like that and don't have any trouble anymore with smoke bombs. And I have discovered if I run the oil higher, it quickly is depleted down to around that halfway point, I guess due to oil ingestion? But thankfully not enough to make a smoke bomb.