Tire squeal in this case means little more than that they are more street oriented tires. "Max Summer Performance" and then "insane track-day specials" like the Trofeos have fewer, wider, and softer tread blocks with shallower depths so they squeal less at same slip angles compared to less aggressive tires with more numerous, taller, harder, and narrower tread blocks.
It's the nature of the beast, and not necessarily any indication that there are handing issues to work out (but of course I'm sure they are doing exactly that in this phase... just don't use the tire squeal as the indicator of any problems).
Keep the faith.
The exhaust sounds great for sure.