If you want to get down quicker, while keeping some power on, you can always use flaps to dirty it up - at suitable airpseeds of course. I personally see nothing wrong with coming back to idle *once the temps are right down*, just clear the engine every now and then.
The glider problem isn't so relevant to you - what we have a problem with is cracking the gelcoat (no gelcoat on a warrior..) Having been up there for a long time (maybe 3-5hrs) and truly cold-soaked the airframe, someone comes down rapidly - perhaps 1000fpm or more with the airbrakes out. The skin warms and expands first, while the core is still cold and shrunk.. hence the gelcoat damage.
Lastly a word on perception. If you've not gone high much, you'll find that after tooling around at 10,000 you'll feel like you're in the weeds at 2000, and want to flare at circuit alt. Just keep an eye on it, and believe the clocks.