Perhaps some plumber's Teflon tape on the BB threads might help.

And for what it's worth, I've periodically heard creaking noises from my Litespeed's BB/crank area. However I had that problem when I used the same crankset on a different bike, and in my case it is a sign that the crank arm / adjustable cup needs to be tightened, rather than something being common to all ti bikes.

Nice bike!