I'm playing a Trillium Octave Mandolin which I string a little heavier than recommended, especially on the high end.
I'm still experimenting, but at the moment I have it strung (phosphor bronze, indiv. strings) all in 4's...44,34,24,14.
I'd say the action is medium...as I like to go back and forth between melodic and rhythmic playing, and do a lot of crosspicking.
I play in GDAE or ADAE like Dagger. Haven't wrapped my brain around GDAD yet.
I'm not currently playing with any pickup, and I don't have a clear pick preference yet...other than it must be medium-heavy or heavier. I use a Shubb capo sometimes, and an Intellitouch tuner when in a noisy session.
re: tailpiece...I have the tailpiece that came on the Trillium which has such a lovely design that I am loathe to replace it with a cast one for aesthetic reasons. However, given that I am using non-standard string gauges, I may go to an Allen so that I can use both loop and ball-end strings without having to cut out the annoying little brass cylinders (and end up wasting strings in the process!).
As for other instruments...
I play a 1980 Martin D-28, a Freshwater zouk (for sale in the classifieds, btw), and have just received a tenor banjo (30's era, made by Epiphone, but a different name on it) that I"m getting ready to string up and take for a spin. On a recent trip to Ireland, my mom bought a bodhran for me, but I don't know how to play it yet.
Otter OM #1
Brian Dean OM #32
Old Wave Mandola #372
Phoenix Neoclassical #256
If you're gonna walk on thin ice, you might as well dance!