Tom and Ren,
Have either of you done this mod to your car yet?
Throttle Cable Tightening
If not, do it. If your cars aren't hitting redline when you normally floor the gas (or engaging power mode) it is possible that your throttle cables are extremely slack. Deruvian who did this mod, commented that his car was only previously hitting 5500rpms and was never at full WOT until doing this mod.
Really slack throttle cables can also explain the 'laziness' of your cars in the low rpm range. Our cars are kinda quirky when the engine is cold, but I suspect that your issues may be different than this quirk...
Doing this mod is quite simple and straight-forward and there are two pics of the wires to tighten on the first page of the above trhead. All you'll need is a 12mm wrench and a little patience.
Good luck!
-Chike