100TD cruiser power questions?

My baby is a Dec 02 TD Auto. It's the upgraded version, same as the 03 and 04 I believe???

It's only done 86000k's and seems to run well enough, although having not driven many I wouldn't really know.

After having been driving it around for a while, it feels 'heavy' and I know it is but I thought it would perform slightly better that I was experiencing. I got a Dtronic and I do notice a difference. Especially the way it holds it speed better @ the 100k mark on inclines and from a standing start. However, I still think it feels like someone is 'holding on the back of it (so to speak) in my mind anyway....it's like the car wants to cruise along a bit better but something is holding it back!!!

That said, before I got the Dtronic I drove an 06 TD auto with a heap of fruit on it(roof rack, bar work, HF radio etc and it felt a lot 'lighter' more responsive and more willing to go...which leads me to my questions

1/ Is there any difference in the engines between mine and the later models?

2/ Has anyone else experienced what I've mentioned?

3/ Could there be a few simple things I can do to make sure the car is running at its best?

According to the log book, it had it's 80,000k service as required.

I may just be a bit anal...but I like my cars to run well, not only perform well and I'm happy to spend a few $$$ to make it that way.

Could the sloppy standard suspension make it feel this way?

Any thoughts please?

I've also posted this question on the Lcool forum.

Cheers