The least amount of yeast, the better. Instant yeast turbo charges the whole fermentation. Fresh yeast provides a better natural fermentation and always easier on your digestive system. That's how pizzaioli normally do it, and for a reason. And that's why they also employ Poolish and Biga techniques -- again, resorting to natural fermentation. Now that said, 7 grams is not a massive amount that would raise eyebrows, but it can be reduced considerably.

Environment temp is important to the whole process, hence the question about what region/temp the OP did his/her prepping. Temp is actually a variable in several formulas. The same formula that might work in one place might fizzle in another (trust me, I've seen it happen. That's why when I do it in a new place for the first time, I create 6 to 8 batches with various measurements to see which one works in that environment).

Finally, I don't think you know what condescension means. Not sure if you are just being too defensive or sensitive, but my questions were meant to genuinely discover more about several factors which normally leads to certain end results. Cheers.