''without any cab added, it sounds great trough a V30 cab'' So thats the way to go... Personally when it sounds good, thats the way I go. If it sounds bad otherwise with a different adjustment... I don't wanna know why I swich to the good sounds and forget all the rest
Yeah, but then it won't be optimal to use it together with a cab-sim. The interesting thing here is that the sound actually changes just by adding a cab sim but ignoring it with the "monitor cab off". It should not do that. I usually make my profiles for use both with PA and cabinet. This means that you can't get a optimal cabinet output if it's also set up for PA.
I guess on the other hand that it's impossible to hear this in a live situation.