I've been compiling information for a while from here and other places to decide how I wanted to approach expansion of my jaw. I'm about to step it up to the next level (see Plan at the bottom) and have a few questions throughout. If anyone has any advice it would be appreciated.  I can post some a results update from my experiment going forward if people are interested.

Face Situation
30 male trying to make progress in a young persons game - mewed for 2 months - chewed for about 45 days. My jaw is narrow/receded same with cheekbones. Face is asymmetrical - one side of my face is more receded/narrower - it sucks.
I've had a permanent wire retainer behind my bottom six teeth for 15 years - could this be preventing expansion/mewing gains?

More details
Class II malocclusion (overbite) - causes what you would expect and some other effects
Mandible receded, Mandible Narrow,  Chin receded,  maxilla very receded/slightly narrow
Shallow cheekbones + very deep dark circles/eye bags because of deep set eyes. Also have really bad double chin despite being fit.

Progress so far
I can breath better through my nose. Tongue has gotten very strong from hard mewing. Masseters from chewing have gotten bigger/defined. I'd suspect my cheekbones have protruded very slightly - this is just a guess from the mirror.

Plan
(already have good diet/sleep/supplements/exercise)
1) Mewing constantly and hard mewing as often as possible. (I heard the digastric muscles that contract when hard mewing can cause Mandible expansion - can anyone verify this?)
2) Face pulling - thumbs to replicate tongue a few minutes at a time, with frequency of every hour movement at low-medium intensity. I like the theory behind this - if there was a face pulling contraption that could get inside the mouth and act like the tongue, I would be all over that. Seems hard to make)
3) Chewing - Chew mastic gum often - big and cold temp chunks
4) HGH - I haven't read of people experimenting with this. I plan on dosing moderate+ daily doses over several months. Unfortunately there are tons of safety concerns. It is hard to monitor. Ive seen information on this elongating jaw and thickening the bone, but not on widening the jaw. Additionally, I found 1 study on rats - from what I got from it - Localized bone injections into the mandible may cause positive growth and eliminate global effects of HGH. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4163820/
5) Expander - This is where I need help. I feel as though I will be able to expand the maxilla with my thumbs. I am concerned about the mandible catching up, especially considering it is already behind. Is my permanent wire retainer behind my bottom six teeth messing up expansion? Also, I am curious of the changes that could take place while using an expander and HGH together.

Thanks for reading. Will appreciate any solid advice. If you have any questions, ask away!