I take tires on and off those rims like it was my job. Because it actually is part of my job. Or the job that I'm trying to make my job so I can get rid of this pesky other job.
Vredesteins fit pretty well, Vittorias are okay, Maxxis are okay, Specialized are okay. Continental Gatorskins are without a doubt the most incredibly difficult tires to mount on those rims. I would rather chew on a Gatorskin than install one on those rims. GP4ks are not much better.
Plastic levers are fine to use. My business cards are actually plastic tire levers. I built a new build of our 85mm clincher last night (same rim manufacturer) and put a Vred TriComp on it. I used two levers. It would be really hard to break the break track with plastic levers, although you could do it if you are careless. I will be going to test that new build in about 20 minutes. Apparently in a thunderstorm. Hooray for me. Fortunately it is a rear wheel.
For disclosure purposes, I am a partner in November Bicycles. This fact probably colors everything I say. I'm clearly not to be trusted.