The water meth setup has a lot more to do with your valves being that clean than your can me thinks.
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thats pretty much what mine looked like when we pulled my mani a while back to fix my oil cooler. a light dusting of carbon all over, except mine had a tiny bit of oil on my valve stems. even with just VTA, your probably cutting down on a ton of build up... meth is just icing on the cake.
2006 Audi A3 | 2.0T | 6MT | APR Stage 2+ | Fully loaded ECU | FK grill | EJ CAI | BSH TBP |EJ DV Reloc. | Eurojet TBE | EuroJet Catch Tank | Cross drilled and Slotted Rotors | EBC "Redstuff" Kevlar | Raceland Coilovers | Forge Side to Side Short Shifter | Forge Front to Back Short Shifter | Devil's Own DVC-30 Methanol injection | BSH RSB | BSH Motor mount Kit | 42 DD Shifter Bushings | HPFP Stage 1 upgrade |