A little report about the RSR's.
Well, went to Spa and tested them all day and the grip level was very good. You just need to warm them up a bit more that 888's I found but that maybe because it was just above freezing all day.
Once warm, the tyres gripped very well and held onto grip , even after a 30 min sprint. Just got to keep your eye on tyre pressures but apart from that very happy with the tyres. Seemed about 90% of the grip of the 888's but half the price.
Next test for tyres was a nice road trip from Spa to The Ring and I can report there not as noisy as 888's or A048's but not great in the snow ! .. Not that you expect them to be.
Also drove back to London on them from The Ring and hardly any wear on them so very happy about that.
Seems these tyres are quite good.
Will be updating the tread after my next trackday which is quite soon , just need to save some money now !