Be careful with the 'unwanted' side - make sure it still gets drained regularly.
My DS2 was very fussy with one side - but eventually evened out. I think one side was more comfortable for him to lie down and maybe had a better flow. Not sure, but favouring one side seems to be a very common complaint.

As for feeding 2 hourly - that sounds very very normal. Keep up the good work. The more you feed him the quicker your supply will catch up. Hope you have a comfy spot on the couch!
Oh sorry I didn't explain, he takes one side...... then 2 hrs later the other... then 2hrs later the other...

he's not favouring one side, he's just getting full quick and then hungry again quick!