The EHPro KFL+ V2 is a non-adjustable pin, so that won't work.
I don't know -- but I'm thinking one of the rings made for carto tanks might work for you. IB tanked has one and it isn't one of the pricier ones. How big is the gap?
I tend to have the opposite problem -- needing rings that add minimal extra between the pin and the connection.
Back on the first page of this thread is the best view of the different heights.
It's a danged shame, but without a pin adjustment, any one is going to be a crapshoot if it fits perfectly.
If a Tatroe or ProVape ring leaves a gap, I'd try the IBTanked ring - it's MUCH taller - though they shortened it a TINY bit from the very first edition. Still taller though...