Good news on yours Roscobbc on finding more power from it (but eek on needing a rebuild so soon after building it). My carb setup stuff I have no idea what dark magic carb tuning is, but it did involve new jets and some other stuff. I did say to them I wasn't looking for "max power" figures, just for it to run properly as it was a pig from idle to around 1800rpm, and wouldn't really rev further than 3500rpm, and backfired on the overrun when you let off the throttle at motorway speeds.
The actual figures the rolling road gave me is irrelevant to me - upon picking up the car it was SO much better to drive at slow speeds and will now rev beyond 3500rpm when I want it to (hardly ever to be honest). It was like chalk and cheese the driveability of it, and felt like a different car - evidenced by the torque graph which shows an almost flat "line" of max 300lbs-ft across most of the rev range (well, you know it fluctuates up and down a bit over the rev range, but its peak was 300, and least was 290 I think). Trying to remember from memory is hard, but you get the gist.
As for my other cars I've tested - I knew my old original 1.9 205 GTi engine started to have issues as it was fine at low to mid revs, but struggled to rev that high - hence the lower than expected max BHP figures. Driving "normally" it was fine though and felt quite "torquey". The FTO has always been consistent in its driveability all the time I've had it - low torque engine, "line" on graph again stays mostly flat around the 120lbs ft figure. But its a Jap high revving variable valve timing engine, so its running as expected. Neither of these two cars went in for dyno tuning - I just had them tested for fun and because I'm interested in things like that.