The only Bren with a double coil recoil spring setup was the Mk I, everything else after that was a single coil.

By dispensing with your double coil you've gone 80% of the way to fixing the issues, the remaining issues will be fixed by removing coils from the striker spring.
I removed 5 coils from my striker spring and the inner recoil spring from my Mk I and was having zero issues or problems firing on gas setting 2 last time I was out at the range.

I'm taking my Mk 3 up there today to compare a ML striker system to the HA one. I picked up a spare lower so I can now interchange freely.

Stay tuned for reports !!!!

Gazza
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