I thought that "Agenda for Change" was supposed to sort all that out ... you know, a common renumeration scheme across the NHS.
I have heard the "we don't get the respect we deserve" comment my entire working life - including (in my case) "pre-biomed" (as a technician in other scenarios). It was ever thus, and probably always will be when working in a tech support role.
TBH, I've never let it bother me too much. I have always thought (probably somewhat naively) that quiet pride in your own abilities should suffice.
OK; time for the advice:- have you tried the private sector (or better still, going it alone)?