Tørm (Torm Cycling). Nice, and not pricey

Low temperature & low agitation washing should keep you at c) for a while.

Wool shrinks as the cuticles in the fibres rub against each other, catching and holding on to each other, in the same way that felt is made. This process is exacerbated in hot water, and with more movement.

Unless you hand wash each and every time, wool is going to shrink & felt eventually.

As SuperWool TM has a exterior polyester framework it wont shrink/felt in the same way as pure merino...swmbo has already put that to the test !