If it's the cable giving tension both ways it could be the cable binding or needing lubed, meaning if it's hard to pull, and doesn't snap back fast enough the cable has too much friction.
If it's tight to pull, but still snaps back easily when you let go that's just the tension on the clutch that can only be fixed by those parts that people gave links for. I say give it a few weeks and see how your feel. Your arm will get stronger and you won't notice it eventually. I even switched to shorty levers and have less leverage and don't think anything of it anymore.