Really great head phones. Bought them for work so i could monitor film sound but ive ended up hooking them up to my phone and Nintendo switch for music. Man does octopath traveller's score sound amazing thru these guys. They do put a little more pressure on my head than say my steel series gaming head set but still pretty comfortable once i extend them all the way out (i also have a massive head so your milage my vary)
DhendlowitchOn my 6XX (same headband design), I extended the headband all the way on both sides, and then put outwards pressure on the earcup while holding the centre of the headband in place. This causes the metal extension part to bend, which should cause some spring memory to be relieved, and they should loosen up a bit on your head.