That's a pretty impressive setup for the Murano. It looks like you've gone to great lengths to make your venture successful. It's too bad that you're over the weight limit, though. It would seem that you're going to be testing the limits of your CVT.
Acceleration is just fine. Off the line you kinda need to be a little careful, if you're turning sharply or if it's wet you can spin a wheel. Once moving she gets up and goes no problem, I can easily hit 50MPH before the end of any reasonable sized on-ramp to the freeway at WOT. Sometimes I get on the freeway and then have to slow down to 60MPH (towing vehicle top speed is 55 here in CA )