Be sure to give it 1 week of listening so your brain filter has time to adjust to the new sound signature. Also, don’t be afraid to move the pads such that the thickest part of the pads are forward instead of back.
There are some cheap cable swaps you can do too if you don’t like the default cable.
Cable can be found by searching Amazon for:
NEW NEOMUSICIA Replacement Cable Compatible Hifiman HE400S, HE-400I, HE-400i(2.5mm Plug Version), HE560, HE-350, HE1000, HE1000 V2 Headphone 3.5mm and 6.35mm to Dual 2.5mm Jack Male Cord 1.5m/4.9ft