Since you cut Ocean Forest with both Happy Frog and perlite you might get away with a small dose of Grow Big. I used to grow in Ocean Forest/Perlite 50/50 and most of the time waiting for the basic three to four weeks standard before introducing nutes was fine. Maybe start with a little less than the 1/4 amount of Grow Bigs published amount. But allow the plant to establish a bit first.
When you begin the paper towel method, don't soak the paper towel. You want the tap root to kind of crawl and scratch it's way to the moistness. Too much water is a hazard for germinating with the paper towel method.