You certainly want to check/upgrade your diverter valve for the turbo. As mentioned, an upgraded intercooler will help maintain power levels through the rev range. Long term you should consider a high pressure fuel pump upgrade, R8 coil packs and good spark plugs.
As for remaps, a custom one by a tuner will generally (not always) be better than "off the shelf" maps like Revo. A custom map can be tailored to each individual engine and supporting modifications, which to me suits your needs because you don't have what some would define as a "full stage 2+". But this is a slightly grey area anyway...
Saying that, the Revo map, when set up correctly, is a fantastic bit of software when considering what it is.
