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You should be able to get it down to around 1.5 lbs without changing the spring.

Yep, that will help. I've got one in my T3x. You can also shorten the trigger weight screw a little enabling it to unwind further before hitting the trigger retaining screw (not really recommended...

A titanium recoil lug on the Tikka T3x won't give you any accuracy improvement over the steel lug - it's just for weight saving. The stainless recoil lug might've been a better choice although that...