Hi there
Could you post your EASY in its right format and I could help answer your BT question. It sounds pretty accurate but just so I can get a better visual!
IRT the DF, I believe Tracy suggested once they are established on solids then attempt weaning little at a time by reducing the amount he is on the breast. Many just let their babies sleep through and it just goes away or use W2S too.
I honestly don't have much personal experience w the DF other than it threw us off every single Time i tried to implement it. But honestly at 15 weeks for a EBF baby, 2 feeds is very normal and especially since there is a growth spurt coming around for you soon at the 4mth age. Regression also hits so things might get a bit off anyway IRT nights.
However, if you'd like, you can get better eyes on the BF page. we can move the topic over if you'd like. More experience there on night feeds for EBF