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Think of opening the fridge and grabbing the gallon of milk. You use your right arm, right? Look at the mechanics behind it:
Take it off the shelf...sort of like a one hand row. Carry it to the counter...like a half-executed bicep curl (also as a negative, since you're holding it there). Turn it to pour...like a side lateral raise. Finish pouring...back to that bicep curl. Back on the shelf...front lateral raise.
You've done this a kajillion times, not just with milk, but in everything you do every day. It's going to take more work to build your right side than your left. Your left is going to put on muscle mass as it's much easier to shock less-used (conditioned) muscle.
Very basic explanation, I know. Not complete in explanation, either, but you get the idea I hope.
How to fix that? Sorry, but IMO, consistency over time is the only thing that will fix this. Uneven weights is a bad idea. Doubling up isn't going to help, I don't think. Studies have been done on this, but I don't think any were done over any real length of time.
My thoughts are that if you condition your muscles equally (remember how important form is, as well) over time, they "catch up and even out" as you increase poundage, reps, etc. Ask someone who's had to wear a cast on a leg or arm and has had muscle atrophy over that time. They shouldn't have stopped lifting with one arm, and lifted more with the other to catch up...
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