Hi there,
My DD is susceptible to OT as well.
With EW i tend to try and keep the nap the same and bring BT half an hour earlier. However if the long morning A is perpetuating the OT/ew then I'd pull the nap back to
12.30 and still cap at 2h and BT at 6.30pm until you are straight.
I have also been known to do this to get back on track:
WU: 5am
Car nap:9.30 (capped at 20m)
Nap:1-3pm
BT:6.30-7pm (depending on how tired R is)
This has always worked for us but Not all LOs respond well and can end up in a ut/OT loop - you just need to judge it really
Hth xx