In your testing of samples, did you by any chance do a direct comparison between them?
i.e. have, say, 5 samples and try them in the editor using the same values, to see how the pitch and (insert sound stuff here to make me sound clever) affects it.
I'm just wondering if a really deep (low pitched, but high volume) sample on the BF1 will improve that, or if a higher pitched sound would work better in the MRT (haven't actually tried the MRT with this, so it might be perfect for all I know).
It's not critisism, I'm just wondering what your working method was, how much experimentation went into it, and what sort of understanding you now have on how the samples and sliders work together.
I'll be using this sound pack until you (or someone else perhaps) releases a whole new pack. I'm not interested in using lone files that will be of a very different style or, worse, ricery. So keep it up!
By the way, I still dislike the gear change sound (which I don't think you've played with judging by my limited testing), so is there any chance of making it sound a bit more like a gear change - something mechanical and clonky on the race cars perhaps. But again, I don't know how limited you are with the sample importer...