Hey. I've been digging deeper into VSA recently myself. I'm still fresh on the scene but I read the same book by Anna Coulling as well as a few Tom William pdf's floating around the internet.
I think your analysis on the above trade was right, but you got shaken out of the trade by trying to...
Not a fan of the way that they trade on OptionAlpha, but in terms of theorizing about Option Trading in an easy-to-understand manner, they are a good resource and have a podcast episode about trading illiquid options here:
To me, scaling in/out is not about initial cost basis, the reasoning behind the technique is to minimize risk until a direction is chosen. It is not a tactic for all trading but it seems like a necessity if your trading system is one that requires constant reentry because of signal headfakes...