i heard it ain't that durable and doesn't pair well with vis
If someone says a rubber doesn´t pair well with a certain blade it is their personal taste more than anything. So if someone says R53 isn´t good on Viscaria that means that´s true for
them, which is ok. If on the other hand someone says it´s a great combination - like I do - it´s also true for
them. In my case I have an idea of what a better player could do with it and would stick to R48 ;-)
Durability is also difficult to pin down, but I think most of the modern Tensor rubbers are quite similar, so you should expect a similar lifetime to that of your Fastarc, at least I wouldn´t know why Rasanter should fade sooner.
Durability of NUZN is on a par with Rasanter, but I am not sure if the step from the P1 to a 55 degree hybrid rubber isn´t one too big. (Same for R53, maybe R48 would do the job with less adjustment needed)
Consider NUZN 50 maybe?
The only downside I see, with a price of 42 Euro before discount in my country your P1 is a relatively cheap rubber, so any more expensive rubber would have to do an even better job considering durability.