“2) should i spend more time in Z1 or what % between Z1 and Z2 should I be doing?”
Do you have ADS? If so, then more time in Z2.
“3) What does TRIMP/rTSS and Pa:Hr really mean in terms of training?”
Can’t comment on TRIMP. rTSS is a “training stress score” (TSS) based on your “normal” pace. It might be useful if you consistently run on the same surface and without much change in elevation gain (or at least a consistent change in elevation gain). It’s useless otherwise, e.g. for hiking or mountaineering, as the conditions underfoot change so much that “normal” pace is meaningless. I don’t know what your mountain goals are but keep this in mind.
“4) should i be paying attention to TRIMP/rTSS and how is that affecting me? same with Pa:Hr?”
Probably helpful to know what feels easy or hard for you over a given day, week, month – i.e. to be able to relate the TSS to how you feel.
HTH and sorry to hear about your spell unemployed, I know how demoralising that can be.