Let as know what you find out what's causing this abnormal sounds. Maybe it needs more drive miles to make everything settle in.
I'm considering of changing my transmission mounts but I would use the Z1 polyurethane one.
For one there's are a lot of plastics/ foams, heat shields that vibrate in the trunk after I switched to coilovers, had to use dynamat to cover all my trunk, heat shield, license plate bracket, stuffed the rear bumper foams with rug towels from vibrating, reinforce my exhaust hangers and bushing.
The price we pay for upgrading our suspension system.
But the car handles so good on the twisties.