Not only is he fighting the track conditions (which are FAR from ideal) but he's also in a totally unknown area with his chassis and wheelie bar set up, because he only just discovered that his sprocket/wheel alignment has been out for a few races (at least) and he's been using the wheelie bars to correct the less than straight running its been causing. Now he's got the sprocket and wheel alignment correct he's having to start over again with the wheelie bar settings.
All things considered 7.8 is quite a respectable time in less than ideal conditions (been very windy in the UK today), on a less than ideal track (I believe it was wet until diner time), on an unknown chassis set up and on low power, very safe settings being shut off 1.5 secs before the finish line.
I know ALL your intentions are for the good of others Johnny (which is more than can be said for Tezz, who has OBVIOUSLY been on a mission to spread negativity throughout the forum of late) and I also know how hard it is to tune from such a distance, as I tried to do so often in the early days of you using my system and all the American customers since, so its all good between us.
Even though Dave is doing quite well, that doesn't mean that your advice was not correct and not needed, because at some point it may very well apply and be the solution to the problem, so I'm not saying we have all the answers (far from it) but we have found a number of issues that we KNOW were EXTREMELY LIKELY to be responsible for the recent failure/s and we have INDEPENDENT expert motorcycle opinion to support our opinion, that a good deal of the cause of previous (and potential future causes), is the generally poor condition of the cylinder heads and this is based on a good deal of previous experience.
All we can do is keep our fingers crossed that all such issue can be dealt with or at least set back by accurate mixture and timing settings, safeguarded by the AFR safety window feature that Dave now has set at a SAFE level.