I'm the owner of a draw bias driver but now that my bad shot is a hook it has become redundant (never say never though). I have to be honest and say I can see all angles. Yes, I'd recommend lessons if the total swing was all over the shop but as the OP is having them already and irons etc and swing changes are working then maybe not.
I can see the benefit in getting a draw bias and using it if its the only club not working and would say that if you can get a cheap one somewhere then its probably worth a go. Other than that, try playing around with the set up and grip and seeing what happens but ultimately if you are still struggling, it really does make good sense to see a pro. It sounds like yours knows your game and will understand your swing (and the changes) and so can give you the information to make you fall in love with the Ping again
I can see the benefit in getting a draw bias and using it if its the only club not working and would say that if you can get a cheap one somewhere then its probably worth a go. Other than that, try playing around with the set up and grip and seeing what happens but ultimately if you are still struggling, it really does make good sense to see a pro. It sounds like yours knows your game and will understand your swing (and the changes) and so can give you the information to make you fall in love with the Ping again