The issue with adjusting the L/R balance with weights not far from the centerline is that it takes a LOT of extra weight to get to 50/50 L/R (as you load the already heavy side too...)... you want to add it as far away from the centerline as possible so you can get to 50/50 with as little weight as possible. unless you're under the limit of course

With the t4, most standard electronics (read: non lightweight lipos) will get you there "by design"