A counter point,, I'm also a metal bike fan and try to exclusively use BSA threaded shells for serviceability and compatibility reasons, you shouldn't be getting any creaking from HT2, one of the nice features if you will of a threaded BSA BB shell is that precession will tighten the cups up if they are loose.
It's worth getting a Park Tool HT2 tool - I have a BBT-29 - which works really well, although the road shells are narrower and will need the plastic adapter you get with them. I don't put any grease - copperslip or otherwise - on at all, if refitting a pair of cups I will put some blue loctite on - I have one of the wax lipstick things, which I also use on any bolts and threads. Using the tool I tighten it up reasonably tight, but don't use a torque wrench on it. Tighten it with the bike on the ground rather than in a stand.