OK so I played with it a bit more and I like it more the way that I have it now.
Assetto Corsa, AMG GT3, Highlands Long
I swapped the 54hz from solely TST to solely Concert. I like the feel this gives me a lot better and I think overall the 54hz being so loud and sent to the TST doesn't really suit it. The unit is good, but I don't think it suits this effect the way it's designed, at least on my setup. Moving the 54hz to the Concert gives a different feeling and it's a lot more natural than what I was getting with the TST. It feels like distortion on the TST even at lower gains, rather than the smooth feeling of the BK.
I have 36hz going to both TST and Concert, and the 6hz obviously only to Concert. Toned down the 54hz in the effect volume slider to 50%. I might change this again now that I've moved the effect off the TST and see how it feels. General balancing of the effects to somewhat mimic the 100/200/200% that you had intended but changed them enough to make them useful. Don't forget unit placement, amp gain settings and overall combination with other effects will all affect the way each user balances the volumes. I'd love to be able to just take someones effect profile and not touch the individual gains of the components within, but here I had to try because if I didn't I think I would have just put it in the bin.
I've just done a few runs around Highlands, love that track, with engine vibes running in tandem, to make sure I can still feel gears and I can. Obviously not as much but it works better with an engine note that is active in downshifts, too. So it blends better with other effects to compliment it. I'll compare it to another Latte effect that I've got saved which also emphasises downshift revs and see how it compares.