RE: Bulking adjustments - help please.
If you're really focusing on bulking up, some degree of fat-gain is unfortunately going to be unavoidable. But like you say, the benefit of it is that you're getting more muscular and stronger during the process so it isn't all bad!
Certainly adding some cardio in on your off days (say 30mins or so) can help limit fat gain and the same applies to manipulating your diet (e.g. decreasing carbs). But the gains may then not be as good.
It's a good idea to bulk up to your target weight (even if you do increase BF%), and then cut-down again gradually. That way you should retain most of your hard-earned muscle and improved strength.
Hope that helps!