ok, how strict is your form on the T-bars? I know this isnt popular to say, but if you relax on the form a little, and get your legs, arms, back into the lift, you will be able to move more wieght. Just make sure your lower back is locked, you dont really want to be using that for t-bars, and make your movements as explosive as possible.

If that doesnt help, I would switch it up to seated cable rows, for a week or two, just to get some variety, and hit the muscle group a little differently, then go back to T-bar.

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