Sorry if this is boring, but the last discussion pretty much focused
on the release / rudder waggle. I can't get to the NTSB report just
now, but I seem to recall reading in the report on the OTHER incident
(loose hand held radio blocking forward stick movement) that the pilot
released, still couldn't get the nose down, then tried adding down
trim to bring it down. If the glider being flown at the time had a
spring trimmer, nothing will be gained by moving the trim. If the
glider had a tab on the elevator, pushing down trim effectively adds
more UP elevator. I often fly a Grob Twin Astir, and have played with
the trim quite a lot. Very useful in steep turns with a fat guy (me)
in the front seat. The trim tab has a surprising amount of pitch
authority. Spoilers might also be a way to get the nose down, but I
would hesitate to open them while the nose was in the process of
approaching stall attitude.
I read the NTSB reports because it makes me think about contingencies:
"what could/should/would I do if....."
I learned last summer that I won't think of something new while
experiencing a non-standard (hairy) situation, so playing 'what it' is
very useful to me.