Friendlies help since especially during the off-season I only care if the tactic works from there I like to make sure my wins are convincing and dominant, however friendlies are less competitive imo then league games so if the win isn't really reassuring then it may not hold up in the league.
Looking out for key passes and how well the team transitions from defence to attack and vice verse and there is a good YT called BTN (Bustthenet) which touches on these aspects and recently him and some other content creators have created the Tactic Tester which is helpful for experimenting with tactics. I would link it but I don't really do those things nor do I have fm22.
Your 352 does remind me of this thread which explains how he took an idea from real life and translated to the game and how he changes his setup when facing opposition tactics , what I would say is that you are thinking very logically (which is good) but you don't really say/know how your tactic is creating the chances from an in game point of view. Although it is FM21, a lot still applies today.