This is my experience as well. I've done a few runs (4mi or less) in my Pace Beams so far. Also size 43 and they fit well. Also found them very bouncy. I am new to "super shoes", so I don't know how normal this is or not. These are my first carbon plate shoes so I can't compare them to anything else, but I can also confirm that I feel myself wanting to run faster due to the bouncy-ness and the rolling effect. I'm not saying they "make me faster", but I am saying that I find my pace increasing despite actually wanting to slow down because they just feel better faster.
I've only got a limited selection of other shoes to compare it to - all the carbon-plated shoes definitely feel more bouncy than regular trainers but the OneMix Pace Beams are probably another step up from that. Is more bouncy = better? Hard to say.
Finally gave them a proper rip today at a Parkrun and set a new 5k PB at 17:12 (long overdue - in good running form and haven't attempted a 5k PB in a few years) - I wouldn't say it's anything to do with the shoes
but the main thing is that they do feel nice as racing shoes. Time will tell as to durability, whether the bounciness causes any physiological issues and what they feel like over a longer race but I'd certainly enjoy racing 5/10km races in them. Full-length marathon is not my preferred distance (not that I've even attempted one) so I'm not going to be a useful judge of what they're like for longer road runs.
