Dick.......Dood,
You are looking for an expert in airspace design, I'm the first to admit that I'm not that.
I have however been working this sector for a number of years. AND I AM TELLING YOU THAT THE RADAR COVERAGE IN THIS AREA IS CRAP! Why can you not accept my word on this? Do you think I am lieing?
Saabs are routinely lost (momentarily) at levels up to F120 out of YMAY to YMML.
I do have reservations about working E airspace, but only in areas where radar coverage is crap. Give me the radar coverage, the staffing (we have been understaffed on this group for at least 5 or 6 years) and the appropriate training and I will do it without complaint!
You also need to educate VFR acft on the implications of their transponder limitations and for christ sake stop them from navigating on IFR tracks.
Regards,
ROOTER.