I don't mind the idea of the gauge cost to change stance, but please round it up/down to the closest multiple of 10.
The combos are fine as they are too.
Upheaval is good, potential for high attack in tank stance, that's nice.
For Onslaught, I get that the bad cost/damage is to avoid using it as soon as it is off cd, but most people just don't want to use it then. So make it cost free and do 0 damage, increase enmity to compensate too.
Shake it off, I really like the idea of a self esuna, but with all healers having access to esuna it's useless. or you need a fight where only the MT/OT gets multiple debuffs at the same time to make it worth a warrior using it instead of a bard/healer cleansing it for you, but that would make warrior mandatory so never going to happen. So why not make it a party debuff removal? scholar already can do it, so shouldn't be too bad for a warrior to be able to bring some needed utility too. Another option is shake it off removes any debuff, even the ones esuna cannot remove, but with longer cooldown (but that might be too powerfull then)
Inner release, I don't mind the shared CD with unchained if the cooldown is lowered, right now it's too long. It's nice to start a pull with unchained berserk and get a very good aggro lead, but most of the time, by the time I am ready to use Inner Release, the boss is pretty much dead in dungeons...So better use Inner Realease directly and not use Unchained, which is a bit sad :/