I've been on that dyno in my old Golf, and the reading seemed about right (104fwkw's compared to a 128kw flywheel figure or thereabouts), unless it's changed since then.
Baron, the T518Z is probably my favourite of the bolt ons. They perform so well for what they are, and seem really reliable too. I have a real love for the Trust range of winders, old school yet perform better than they have any right to compared to their on paper specs. I had a hankering to whack a T67 on my car the other day
As for the cams, a mate of mine said he was experiencing bind with Jun 272's with 11.5mm lift and Jun valve springs (same as my setup), and had to change the springs to Tomei's so you may be onto something with the lift. He is a drifter though so sustained limiter bashing.