I posted about this on another forum recently. I'm glad to see that it isn't just me.
I have some Khamsins which are essentially the same as Ventos .
I have damaged my rims using metal tyre levers trying to get some new Vittoria Rubino Pro intrepids onto the rims

When I finally got the tyre on the rim I had gouged huge bits out of the braking surface and the tyre was stuck so deep into the central part of the rim that the walls of the tyre are invisible.
I tried them on my old MA3 rims which are 8 years old .Just the same.
I think they are either a poorly made batch of tyres or manufacturers are making tyres smaller so they don't fall off rims and they get sued !

Bought some GP4000 this week and they are almost as bad. I've pinched two tubes today getting them onto the rims with tyre levers. Grrr

I'm going to try some Michelin Pro's next