CPW, your foliar spray idea I'm gunna try on my next ID grow. I always use granular kelp in my mix. Speakin of Kelp...many years ago, probably 25 or more, as a golf course super, whenever I over seeded a golf green, I would mix the bent grass seed with granular Kelp, which at that time it was called alginic acid. I bought it in 50lbs bags for around $17 a bag.  It was a combination of kelp and other sea weed extracts. Doing this would allow the seed to have a little wider spread out of the spreader, I could see the seed spread much better, and it provided nourishment for the developing seeds. It's good stuff ! I wish I woulda invested in that stuff back then. I found this article enjoy. https://www.golfcourseindustry.com/article/bionutrition-122911-acadian-seaweed-extract-bentgrass/