sorry for not being much participative.. (and perhaps for what I'll say now :p)
When I started playing for both challenges, I had difficulties in spotting potential graze sources (for SA) and CherryPointMax improvements, there were materials (replays) but the games seemed to have way more keypoints (and some/most of them felt unobvious to me) than I'm normally able to recognize. So all I did was improvise/experiment for the most part, and try to take advantage of certain patterns that I were expecting beforehand (but still not knowing much what to do about them). Here I'm more like, complaining about not having a strategy guide to read (some games with simpler scoring mechanics such as Varth and Thunder Dragon 2 may not require more than one decent gameplay video -- or an input file from a STGT teammate, in the case of Varth :p), some days ago I was complaining more about grazing :p (and again, these games prove to be more enjoyable -- like most shmups I've played -- when you do get through the first stages, since the latter stages have better potential for cherry/graze and I was directing too much effort into executing the first stages well. I was feeling that, since the graze count on the first stage was disappointing, I should risk myself more, and didn't notice that the game didn't reward me well enough for the risk taken in stage 1, which was/is the main cause of my restarts)