Thanks for taking the time to do some critical listening guys, and for giving it a run through your mastering chain, Kevin. I appreciate it!
I admit it got a bit bright for me on that test master, but I realize that's more how a lot of modern recordings are mixed/mastered - when I pulled up a couple of tracks from Clockwork Angels for one of my references, I couldn't believe how uber-bright they were. I found "Test for Echo" a little closer to where I like to hear things, in terms of having a top end that's clear but less emphasized. But I could probably get away with opening up my top end a little more than it is, since I don't want listeners to perceive my next release as sounding dull vs. most of the other things they listen to. If you're both hearing it as not having quite enough top end, a lot of others probably will too, so I probably need to split the difference. I actually already have a Clariphonic DSP plugin on my master channel in the DAW opening up the upper mids and high end some...I can inch the top end dial up a few more notches and see how that does.
I might could deepen that dip around 300Hz just a little more too. I try not to scoop the low mids too aggressively because I like a mix to have some meat down there, but if it's coming across as a tad muddy, I probably left a bit too much in.
Like I said, I have a scooped multiband preset I used on the compressor, which matches my mixing style and needs. Mastering your mix would require some adjustment, perhaps even some pre-compressor EQ'ing, or a different compression strategy altogether. I like how compression unifies a mix, but sometimes it also reveals little things that have to be adjusted. I've gone back plenty of times when I thought I was through and brought up/down elements in the mix that the compressor revealed weren't quite right.
But I still liked how easily it came together. Like me, you seem to mix with the philosophy that very little should need to be done at mastering. Mastering for me is really just about keeping consistency from track to track, and most of that in the end process is just having the rough volume/levels right from track to track. I still let some tracks be a bit bassier than others, or allow the vocals to be center stage. Mixes are allowed to have personality.
You vocals are very front stage, which is fine especially for 80s style music.