Hello!
The problem is, you dont have enough light for 3 gallon DWC. You could easily run 600W HPS over that plant and get great results. With good light I estimate 200 grams. With 93W true led is not enough, the light penetration is maximum three set of leaves. I think that you have been doing a really good job with the plant to get that much growth, it just lacks power to kick the flowering in. Used 600w hps is like 100 bucks with a ballast, if you can afford it + temp control go for it, DWC needs power!
cheers