Sharon
with all that is going on I think if you try to be consistant then you will eventually get back on track. How long A times for your lo? With spirited babies (I have one), I actually found that when the tired signs hit, she is tired instantly, so did not do any wind down at that age. Have now started doing stories becuase some times there are no tired signs.
It is normal for sleep to be bad when developmental milestones are hit, so persevere. Also, if worse comes to worse your lo is old enough now for PU/PD.
Also, around this age, I found that shh/pat didn't work anymore, so now I stroke her leg gently or gub circles on her bum (she is a tummy sleeper), so experiment a little, it may help.
4 hr Easy will only work if you can consistantly do 2 HR A times, so if lo can't, then 3.5 hr easy is def the way to go.