With the bearing if its happening a lot id say be a hub chewing them but no way to tell until you get it out. As for make japparts is best bet.
Boost controllers I wouldn't recommend. Mine was disconnected I will leave it to the mappers. Personal choice but to many horror stories have put me off using mine now and my car originally was going to be a track toy though.
With the wheel drag feel maybe a sticky piston on the caliper buckled alloy wheel tracking like you say maybe just balancing.
With the ecu light unless its thrown a code up I shouldn't worry too much. Unless you get it more often [emoji4]