Would I gain more exp if I use my 2nd account to host a race and use all 4 drivers on my main account to remote race rather then use 1 driver from my main account to remote race with 15 others.
Yes, since all four drivers will get there own credits and exp, compared to just one. Add a few other people on your other account so you can get a grid of 16. I remote race on my GTP account with all six drivers on my main account and fill up the rest of the grid with friend's bobs.
I would add you but I am waiting on a new blu-ray drive as mine has broke, so I don't know when I'll be up and running again. If you post in here (B-Spec Remote Race Friends) I am sure you'll get plenty of other offers.