I use SXT3 and am a bit mixed on its performance, I think it depends on the track as well, at Crewe on their Prima GT carpet if the rom hasn't been used all week then no additive is needed but if the carpet has been cleaned then you need something for the first 2 heats. It's that close between heats I drop off the car do the rears Marshall then do the fronts (normally inside to centre) At Tamworth I needed full additive all round but had 30mins plus between heats so after marshalling, my local clubs its full rear and half front as soon as you come off as the carpet is rolled up for sometimes months between races and you only have 15-20 mins between heats
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