Sorry for those people having a rough time with NWs - they have been the bane of my life recently.
I seriously hope I'm not counting my chickens, but we've had the best couple of days & nights in a while, but by rather unconventional means! We now do 2 shorter, capped naps, with slightly less A time between.
The difference has been pretty mind-blowing. Last night my son slept >11 hours straight through, I was stunned - we have only ever had 11 hours twice when he was poorly. I'm sure he is just catching up on the OT, but I felt like a different woman this morning.
It seems that the one long, one short was causing some weird OT/UT vortex! The long A was tiring him but the long nap was stealing from his night. So the 2 x 40m sleeps with less A, seem to be keeping OT at bay just enough & he's nice & tired at BT. Hubby & my Mum have both commented on how happy he is too (that'll be the benefit if a full night's sleep little man!)

I feel a bit like this is going backwards with regards transitioning to 1 nap, but it is obviously what my baby needs right now. Sacrificing the 'recommended' long nap for a consolidated night sleep wins hands down for us right now. Probably won't last long though as nothing seems to where babies are concerned, does it?
Really hope you ladies solve your NW & nap issues... it's such a shame we're not all given a manual for our baby when we give birth to them!