First and foremost from my limited experience with the Rocca (Only one shave in) I immediately came to the conclusion that it is an aggressive razor. Much more so than the R89 or R106, therefore I am thinking that perhaps you are applying too much pressure?
Maybe you are trying to shave the same way as you have done with your previous razors.
An extremely light touch is all that is required.
Finally I find the Muhle blade horrible YMMV but I would definitely consider an Astra SP, Polsilver SI, Gillette Blue, Personna etc. I have read that some people like Feather blades in them but they must be crazy fools.
I used the Astra SP for my first shave with my Rocca and was highly impressed. No weepers, No irritation and a very close BBS shave.
Don't hang the towel in after 3 shaves. Try as many blades as you can.
I would leave your skin rest for a few days and give it another go then with a different blade choice.
I personally do not think that the Rocca is a daily beater for me as it is too aggressive but it is definitely a razor for that special occasion.
Best of luck with it.