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What is the brand and model of your shower valve/faucet? is this only happening in the shower?
So this is a 2 handle shower valve?
There are no adjustments on an old 3 handle valve. The most likely culprit is either sediment in the hot water side of the valve or possibly a flaw with the stem. With a valve this old stem replacements are aftermarket, there are no more OEM stems left around. We've had problems with aftermarket valve parts not functioning as they should. It sounds to me like the hot stem's washer might not be clearing the seat as much as it should which would limit the flow, explaining both problems. I'd pull the stem, flush out the hot side and check the washer on the stem. Is it loose? can you install a washer that's not as thick?