I've found it can take a while to get properly dialled-in. I bought a Speedmachine 3 years ago, was a complete wuss about riding it around traffic the first year - didn't ride enough to feel at home on it, rode it a bit more the following summer, then this year have been doing all my riding (mostly commuting) on it.
Whilst I could ride it to a basic degree fairly easily from the start - it's USS which I think's a bit more intuitive - getting smooth turns into bends and hillstarts has taken a lot longer - taking some tight r-handers fast still seems to give me a little trouble.
Very occasionally I'll still brake abruptly at a stop line and have the front kinda pogo back up as it unloads, which has almost caught me if the bounce goes away from the side that I've got my foot unclipped for - but I've only had to put a hand down once, and that was in the first few times of riding it. I still need to practice sharp u-turns - or at least, as tight as the USS will allow.
Some time ago bought a (cheapish) s/h Hurricane to see how the tiller/seat suited me - at the time I still wasn't entirely sure I'd got the right bike in the Speedmachine, although it ticked all the boxes it still seemed wobblier than I'd remembered the Hurricane being - tho' now I've very happy with it.
But I still need to spend some decent time on the Hurricane to get my head round the tiller. Funny thing is, it was a Hurricane I spent the most time on at London Recumbents, and was riding it pretty well by that point - even doing pretty tight u-turns - I just wasn't sure about the seat at the time, which now I'm pretty sure would have been fine.