Tau not having teleport attacks is purely fluff I don't see them being unbalanced by getting them, especially if its only as an upgrade to one type of ship. They have used this same type of attack in the books tho so I don't see it really being a problem. Making it a bit expensive and letting them bypass shields would be a unique fluffy addition
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+1 hit is good as an upgrade
Gravitic Wedge could just be an automatic 1 damage that the power ram adds to imps
Disruption Field sounds cool but maybe an always on effect where enemy ships trying to target the ship receive a -1 to their leadership tests (this would apply to Lock On and to shoot at the Protector instead of another ship).
Experimental engines are good +5d6 aaf is good too
Advanced bridge is kind of iffy tho, maybe just a +1 to leadership tests?