When you buy a new racket there is no guarantee that it will play the way you expect, straight out of the box.
It may take some time to get things together.
You are going from head light to head heavy so it’s a fair bet that you have timing issues.
There is only one technique for hitting a shuttle and that’s good technique, no matter what racket you are using.

My advise would be to forget the prejudice you have built up for your new racket and start again.
Book a court and practice. Playing games is not the best way to get to know your new racket.
When Paul is testing it’s in a controlled environment to enable him to make an accurate assessment and really explore the rackets capabilities.

When you’re hitting overheads make sure your technique is sound, use an easy swing and let the weight of the racket do the rest. Once you are hitting crisply you can slowly increase the power.
For racket handling hit the shuttle against a wall using FH and BH strokes. Use a partner for fast drive routines.
A couple of points.
Your new racket is only one gram heavier that your old one so it’s just the balance to get used to.
Don’t go back to your old racket, in fact don’t even have it in your bag.

Hope this helps and good luck.

Roger