Firstly, apols for length, but need to state the background to this, so hopefully someone can help.
Would ideally like to get to a regular 8pm bedtime with DD, without the epic amount of faffing that has been occurring for last 12 months +. Currently she's coaxed into bed by around 8:30 and then can spend anything up to 90 mins getting up and generally giving the runaround to me and DH. We never reward this or cave in or do anything to rev her up; it's just a constant putting back to bed Groundhog evening, or tedious lying with her in the dark until she drops off, which is hugely unpredictable in effectiveness.
I've tried moving everything earlier like her peers- 7-ish, but this simply lengthens the misery and groundhoggery to 3 hours with very little change in behaviour. Sod that. Also it would be very difficult in our situation to bring evening meal forward much further, given work.
Once asleep, she has always been good at sleeping through until a respectable and manageable time in the morning, which is something.
Routine day naps are long dropped, except at nursery, she goes 3 days a week and they practice lunchtime 'baby voodoo'
and they all miraculously sleep together for 1 hour
. She's also been ok/better with babysitters. So it must be something we're doing 
She went into a toddler bed at around 17 months, as she was a climber and jumper. She's tall for her age and very resourceful so has been able to open doors, put main light on, move furniture to do so
and generally muck around; much to our complete frustration.
So, having tried lots of the techniques and persevered for recommended amount of time; what else can I do to crack this, before I crack?
Evenings are an absolute wasteland and we have to creep around to make sure she doesn't get ideas that exciting things are happening (yeah right) and wants to get up.
Sorry about that. Tips / pointers appreciated, but please don't be offended if I give a 'yep, tried it, not worked' response as I'm genuinely keen to find something that will finally get us to a good place with this. I'm not an avid reader of baby manuals, so there may be something obvious and helpful I'm missing...
Willing to go back to basics and take a bootcamp approach.