Not a fan of milk. Protein powders are not my favourite either. I would just eat more real food. If you are going to use a whey product, mix it in water.
Out of those 2, I would go with proviron because it will just make your stack better. Mast is more of a cosmetic drug, best used when below 10% body fat.
Nothing wrong with taking a break to reset when you aren't feeling right. Some people try to grind through it but I always find it best to break and reset so good job. Congrats on that vascularity man. That is amazing. You are absolutely crushing this.
Standard PED dose would be 50mg S4 and 20mg GW. You would also love the results if you were able to add either RAD or Ostarine on top of those 2. Not necessary but would just take things to the next level.