Mike,
With your knowledge and experience, you should be able to break previous "days to maturity" records for indoor growing using 100-200 Watts as the only light supply. You can read about these elsewhere on Bananas.org. Send me a message when it fruits.
Number of leaves is no indication of maturity. Check the postings -- most recently by
Gabe on this subject.
You must mean 2100 total ppm -- which is not a useful measure considering the concentrations of micronutrients etc. in the product. Find out from the manufacturer what dosage of the product gives 100pm Nitrogen, then work from there to get the desired feeding concentrations of N-P-K, etc.
That's about it for me on this subject.