I agree with all your picks except Jake over Nick. I think Nick would box his ears off and probably finish Jake off. But besides that I have the exact same picks.
Jake has some shitty wrestling but it is probably enough to take Nick down I think. He has some overwhelming top control when he isn't as drained as he was fighting at welterweight. Nick won't be able to submit him ( I think Jake has the better BJJ out of the two ). Probably enough for a decision victory for Jake.