No, one of our members here did exactly what I posted earlier (following the example of the yanks) and made 137kw. Big dyno or not, that's still respectable i think. It's doable, people just hate on...
If you want power go the P29/PM7 pistons, shave the head, and run a big cam (Crower stage 3 is what the yanks do). Will end up with comp around 12.5:1 more or less. Need the big cam and a 98RON tune...
Maybe run a little injector cleaner. But idling at 1000 isn't bad, should probably only be 750-900? Look under the bonnet, there may be a sticker than indicates what the idle should be.
I wouldn't recommend building the D if you aren't mechanically experienced. Takes a lot of modification to build a 'monster'. You're looking at a complete rebuild with new pistons and a full head...
Take a picture of your engine. The engine number should be printed on the left hand side, front of engine, just on the block where the head/block meet.