It's propensity to change directions rapidly is a function of it's (extremely) short wheelbase. They all do that Sir!
As for feeling twitchy that's usually down to a combination of too high tyre pressure, poor geometry set up (and there are lots of variations/views out there) and worn suspension components.
Once you've dialled it all in they are a joy to drive but, like any mid engined car, you have to watch it approaching the limit (which is unlikely on the road) as lift off oversteer is rarely caught.
Guy (on the road for 25 years in a replica now...)