Been a few years now, but my memory is that I used a Dremel tool to trim our Air Flex extension outers (last few threads) to get them to work. The Air Flex threads are plastic or nylon - easy to trim. Can't comment on other brands of extensions. Also (as noted in the earlier threads linked above) someone else solved the problem by removing the extensions and trimming the other end -so they would screw further unto the valves, again effectively shortening the exterior and exposing more of the inner "stem".
2012 Solera "S"
Calif SF Bay Area