Finding a happy medium, is going to be the vain of my existence.
Now this is only my personal take on things, so here goes.
Someone who has joined a verification site, is no farther ahead in the game, at least with me, than someone who hasnt joined a verification site. What does your screening membership ID tell me? Well, I am only familiar with one, but I assume they all work off of a similar concept. It tells me that you paid a fee, to receive a membership ID, that keeps your identity anonymous. Knowing you are Fred-21-M-1234, doesnt tell me anything.
If you contacted me and presented me with two references and their information, or if you came to me through a site, with those same two references, in the form of an okay, they are still the same two references, they dont carry any more weight or value, and neither do you.
A TER username handle, that is connected to your two reviews, far outweighs in value and information, a screening membership ID with two okays, on any given day. I will NEVER except, a verification site membership ID, as my sole source for screening. But I have absolutely, excepted a TER username handle, as my sole source of screening. Provided that it is connected, with his posts and reviews, that is sometimes all I need to know to need know.
It boils down to this, she has to be able to make a decision on whether she would feel comfortable seeing you or not. Ask yourself this, if the tables were turned, could you make a decision to see someone, based soley on the information that you are willing to give her? Would you see me based on Jaycee-29-R-1234? No pictures, no reviews, just some okays from people that you dont know?