Do you have any tips on the Raceberry? My mate didnt really like it so went back to the V5 and it seems to have clicked with him and he is loving it.
Getting on topic, both are good cars, T4 is a belter, the TRF is harder to set-up although once working is rapid.
The thing I found (and some others) is that TRF 417's don't like front gear diffs unless they have really thick oils (500k). They handle better with the spool as they have a lot of front end. Also Ackerman makes a lot of difference when running on Carpet to calm the back end.