hi sarah,
what you have experienced, we experienced as well.
when we started EASY at 2.5mths, i tried the df. we previously just put her to sleep and waited (within reason) for her to wake on her own to feed. i began implementing the df (i found bf for it was hard too) and after about 1week decided that it was too intrusive to her nightsleep. i suppose we could have tried to do it earlier in the night, but i really think dd did just fine left to wake. most nights she would go 7-7, and the odd day 7-4 , quick feed, waking at 7. doing the df meant a whole bunch of crappy nightwakings for us, so i chose the one possible nw'ing over df'ing.
if it works for your dd, it is fine.
as a food issue, as long as she is thriving and full...she'll probably continue sleeping thru. i wouldn't serve solids at all...you might be able to poke in an extra breastfeed if necessary. i found bf'ing that my boobs really couldn't handle the long stretch and only the four feeds, so i did need to supplement. however, my supply wasn't so good to begin with...and you may be better off, iykwim? (if your supply is better) i am sure these bf'ing ladies will have the right advice for you on that. pumping is a good way to go to help this....i have to admit though, i was lazy.
hope some of this helps
sami