Welcome to the insect world, Dr. Jack. I once had the little buggers fill my
hole in one afternoon, as I attended to some routine items on the ship. I
religiously keep the hole covered, now.

You can apply reverse pressure to your pitot, static and TE lines from the
instrument panel. be sure to remove ALL connections to your instruments first.
Then I give each line, short bursts, of compressed air, as I watch the hole for
debris exiting.

Your L-Nav should be on the ships pitot & static system, also check the ASI
calibration page for correct numbers (see manual) the constant tail-wind sounds
like a pitot problem, L-Nav not generating a good TAS, so it must drive in a
big tail wind to make things equal out with the GS its getting fron thr GPS.

Its only October, you got all winter to work on this. Don't you just love a
challenge? :)
JJ Sinclair