I have a suggestion. There is a chemical found in some products called sodium lauryl sulfate. It's a surfactant, that means it helps things to lather easily. It's basically a detergent and it's the base ingredient in most liquid hand soap and dishwashing detergent. It can also be a skin irritant. It dries my skin out terribly. Proraso contains SLS and this very well may be the cause of your problem.
We got rid of all the SLS in our house from shampoo, hand soap and so on and I no longer have as much trouble with dry itchy hands and itchy scalp. I never use any shaving products containing SLS as it dries my face out. The only exception is dish soap because we can wear dish gloves.
Try using a cream or soap that does not contain SLS. Most hard soap don't have it but some do. Stay away from VDH, it has SLS as well.
If you want a nice Italian soft soap that lathers superbly try Cella. Also, Nivea sensitive irritates my face as well. Try a different after shave.
TOFLAC-U, AOM, LEMS/ Stay back! I have a Merkur, and I know how to use it!