New Nelo 520 and 540

Hi All
I have been looking at the current generation Nelo 520 and 540, both L. I am confused as to the stability of these boats. It has been said that the current gen 520 is more stable due to changes in hull shape. I have heard that the older 520 was not as stable as say V8 and V9P but I guess that might have changed?

Can someone make a comparison of these 2 models in their current generation to a V8 or V8P (or even a V7)?
I want a stable, all-conditions boat and trying to understand whether I can trade off some of the stability of 520 and go with 540 while still being in at a similar level of control in the rough or play it safe and stay with a 520.

I am going to paddle both on the weekend, but I am certainly not going to hit all possible conditions I am targeting.
Thank you.

To answer my own question. Paddled both yesterday. Initial impressions that the new 520 as well as 540 are less stable than a V8P. Keep in mind however that I haven't been in a ski for about a year, so my perception may be coloured by being rusty. 520 felt like a surer bet than 540 so I bought it. It's faster than it's looks suggest, has nice glide to it and very nimble. I think the stability on the 2G 520 is more of an intermediate level.