I think 2ius is a good starting point for you to build on but 2ius never really helped me, I would cruise on 4ius when i was priming and double it when on cycle, but that doesnt mean you have to. If its your first time start low like you have stated (2ius) and build it up to 4ius and when you go on cycle try and tip it to 6ius and then back down to 4ius.