Thoughts please.

Although I don't understand myself, I have heard that adding oil does in
fact make the fork stiffer. I believe it has something to do with the
compression rod being more fully immersed in oil, but I am likely wrong.

I don't believe you've lost any travel, and air in a coil fork shouldn't
make any differences in anything.

Try rec.bicycles.tech, too.

--
Phil, Squid-in-Training