RE: These really are hard to start!
Since it's the weekend, I'll offer a couple of thoughts for you to consider.
ZDZ's need to be "wet" to start (when cold) or you're wasting your time and the most common issue I see with them is that you must have the choke closing all the way whether you use a servo or manual setup, make sure it's closing. Once you verify that, the 5-5-1 thing is a good place to start and you'll figure out what works for your engine as you get to know it better. I run mine dry at the end of each flying day, so it takes a bit more for the first start but the key for me is listening for the "snotty nose" sound from the engine when you flip it over with the throttle cracked and the choke closed. Once I hear that, it's choke off, ignition on and mine will usually go the next flip. If it's still a bit warm, no choke just turn on the ignition and mine usually go first flip. If it's been sitting for an hour or something, I give 'em one choke flip and they usually go the next flip. I always turn off the ignition when choking because if it fires with the choke closed, it'll be flooded and you're in for more flipping.
You mentioned it getting hard to start after setting needles; it is possible to set them just a tad lean when they are warm and then it's tough to get 'em going again when cold. Now we're not talking about a lot of difference in the low speed needle setting here either, once you're close, the width of a screwdriver blade may make the difference. So when you get close, be gentle on the final needle adjustments. If it's new as it seems, being a bit rich on the bottom will make for easier starting and it's definitely better than being too lean.
I wouldn't monkey with the timing as in my experience, if it's set correctly there's no advantage to changing that. If you advance it, it may run hotter and make it more difficult to start without any performance gain and if you retard it, you'll lose power although it might be a bit easier to start. Just leave it alone, 6.5 mm is used on a lot of the ZDZ's, but I can't remember if that Super uses 7 mm?
One last thought; if you have the Bing carb there were some issues with those and I think RCS is recommending and now selling the Super 80 with a Walbro carb.