In reply to Olbert:
What I would say is that the Testarossa is built on LS’ most aggressive last, the only shoe which is built on the same last is the Genius. The Testarossa is a wide show by Sportiva standards so I’m guessing you’ve got broad-ish feet..?
Saw you mention the Genius. No-Edge shoes are a really interesting one. I climb in them quite regularly, and currently own Speedsters (41.5), Futura (41.5) and Genius (41.5 & 42). I’ve climbed in No-Edge shoes on a range of routes, from eliminate lowball boulder problems to Alpine grand courses.
For me they work really well, the only time I struggle with them is on cracks smaller than a .75 size. That being said not every NE shoe is for everyone, not every NE shoe is for every route. Generally the Genius works best on Granite and Limestone. Whereas I can find that I prefer my speedsters or futuras on sandstones (I climb fairly regularly in Northumberland, and confusingly also Southern Sandstone).
There’s also some important considerations around sizing with No-Edge shoes that you’d do well to bear in mind.
A friend of mine wrote this article on them, and generally I find it chimes with my experience of them. https://www.no-thrills.com/no-edge-climbing-shoe