IMO your doing too much especially since you plan on training 6 days. This is what I would recommend.
Push1
3 chest
2 tricep
1 shoulder
Pull1
3 lat-pulldown movements
3 Bicep
Legs
3 quad
2 ham
1 calf
Push2
3 chest
2 tricep
1 shoulder
Pull2
3 row movements
3 bicep
I have had great results with this formula. I can send you a spreadsheet of all the workouts if you like. You can sub whatever you movements don’t agree with you.
What does a typical day of eating look like for you? 1500cal shake is a lot. I would try yo eat more smaller meals(5-6) throughout the day with 30-40g protien at each meal.
More than happy to help if you have any questions.
Keep at it. You’ll get back to where you were in no time.
Check out the T-ransformation challenge if you have not already. It’s a great way to give/get motivation.
Here is my log if you wanna see what I do for training/diet.