Hi again,
Alex the Guest: Thanks for your reply. Yeah, I have been elevator trimming. Trimming till my fingers bleed. Which, as CRJCapt pointed out, is most likely part of my problem. Yeah, glad to see another Australian. Possibly the only Perthling, though. No problem with that - I'm best placed for the finale of the Red Bull Air Race this Sunday

A friend of mine has a fifth floor apartment near the Swan River foreshore, so I won't have to worry about crowds and traffic, I'll just sit back on his balcony with a beer with those Extra 300s wizzing around for my viewing pleasure
CRJCapt: Thanks so much for your extensive and informative reply - much appreciated. I have a feeling your advice is going to be very helpful when I get back on FSX (probably tomorrow night).
Controller setup: I have a Logitech forcefeedback joystick with two of the panel buttons below the stick assigned to elevator trim (from what you've said about over-reliance on trim, perhaps they're
too accessible). From you're advice, it seems like my null zone is too large (about 15 - 20 %) and needs reducing. The sensitivity is cut right back to less than 10% at the moment but I guess I've been too extreme there - overreacting to my frustrations. I'll raise it a bit.
Techniques: I'll try those out. They all sound logical and you're right, I have on occasion been attempting to fly the aircraft using the trim controls - and obviously relying too much on the VSI for fine tuning of aircraft attitude. I'll take the steps you've suggested - and especially try to get over my fixation on the VSI (you were spot on about that!). Again, thanks. Great to get such prompt and comprehensive advice.