I wouldn't worry about the ppfd. The numbers reported by that site look to be extremely fabricated when compared to top of the line industry leaders such as HLG.
Just listen to your girls. They'll tell you if they're getting too much light. The stretching is probably from a lack of light honestly.
I found it odd he didn't review his own light. Very odd. I felt better about my purchase after finally seeing him review his own. It was also very helpful because he says how many diodes are on the light in the video. I couldn't find that info anywhere else. 180 per bar on the pro version for...