Got it working!
I figured out what was wrong and boy do I feel like an idiot.
These controllers have a "global channel" out. On the unit it is Channel 00.
when I sent the msgs back out via SendSX, SendSX was set to output on channel 01.
Part of my problem was that I am used to "00" as Channel 1, in Sysex/standard MIDI hex formats.
This morning it dawned on me to try changing the channel to 01 and immediately I got NRPN's to work.
Not only did i get the Evolution to work, but also the Oxygen 8 V2.
I will get a chance to tinker with it more tonight, but so far I managed to get it to do NRPN's of the Filter Cutoff and PWM pulse offset. HAWK displays the CC/CE's with running values changing as it should.
So sorry for my ignorance Mike. I should have figured this out long ago... I cannot believe I managed to let this slip past me.
Thanks so much for your attention on the matter. Looks like I am on my way to making a nice controller system to tweak any parameter on the fly.