cannonade supersix evo 2020 size

can anyone give me some reassurance on which size bike to buy.
I always had a 52cm in the previous style of frame and now cannonade have dropped the 52cm
I fall between the 51-54 size
I have a 72cm saddle hight and 54cm from the tip of my saddle to the centre of my bars.
if I'm spending that much cash I want to get it right and all my local shops have no stock to sling my leg over...