I'm not sure why Bioware decided to nerf the spec that requires 20+ keybinds, and buff the spec that is based on 1 attack.
My suggestion would be to make the increased force camoflage duration option for watchman to instead be increased guarded by the force duration (six seconds, if two points are put into the box). That would make up for the nerf that Bioware did to watchman spec's self healing. A buff to guarded by the force's duration would encourage sentinels to use the sentinel set bonus instead of the guardian set bonus.
I have a valor 98 jedi sentinel, and have played the game since early access. I used watchman spec almost exclusively until patch 1.4, and it's my preferred spec. It requires way more skill to consistently do 750000+ damage per warzone with watchman spec than with rage spec.
After patch 1.4, there are so many rage specced players, that some warzones will literally have 4 rage spec players for a team.
If rage spec is nerfed, and watchman spec isn't buffed, then sentinel will literally have no viable PVP trees. Combat spec is awful with how many sages run bubble stun spec. Watchman's dots still tick while stunned. Precision Slash has a 4.5 second duration, which a bubble stun severely hurts. The main option would be to break the bubble with a 10 meter attack, but the sage can reapply a stun bubble once they see the Precision Slash buff.