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@y-s
it's pretty normal that your HR goes up for the same power output when you're in the drops.
HR goes up in the drops, I think, because you need to use your upper body a bit more. Also the movement of hip joint/thighs are slightly more restricted(depends a bit on your flexibility, of course). but in real life, aero advantage of being in the drops are far greater when you're not in the bunch/working at the front.