What does that wheel thing have to do with anything, yours are 26" right?

I'm 5'2" (157.5 cm) and ride a size 49 bike with 514mm effective top tube & 80m stem and 700c wheels, and it's not twitchy.

I would need the 46cm LHT myself.

I'd get that pro fit ASAP and if you got the wrong size try to work something out with the shop. Too-big frames are a bummer, I went though a lot of those before I figured out what was wrong.