Finally ready to jump on here now (DS is 2y8mo)

Mr High Sleep Needs has recently had a big growth spurt and developmental leap, and we're actually getting nap and BT resistance, and the odd EW as well

He was happily doing (until about a 2 weeks ago) 7pm - 8am overnight and a 2 - 2.5hr nap from 1.30pm.
Now he's managing to push BT out to 7.30 or 8pm and waking between 7 and 7.30am. The nap has crept forward to 2pm (he ended up going down at 2.30pm today as we were running late!) and I've capped it to 1hr 45min for the last two days. He doesn't seem to be tired at all, lthough his eyes were looking shadowed today

Bearing in mind he's always been very HSN, I don't know if I should try to cap the nap more at this stage and see if he'll tack on a bit at night, or if I should take it slowly and keep at 1hr 45min until he's used to it and see if he'll calm down a bit at BT?