Scud man,
I too set up both of my cars the same, with one minor difference, the "R" has been shortened and it has about a year and a half of dialing in.
I dropped the R on Kissimmee this weekend and made some laps the car felt good, could have made some adjustments and it would have been fine.
I then switched my radio over to the X and threw it down, It was very good at speed, a little lazy going in, a little ass happy coming out.
I ran the X and had my fastest single lap at that track 18.4 I think
had lots of bad luck though ... new car blues.
We will be going back to Kissimmee in December so I plan to have all of my $%*t in one sock