Yes, I think you would be fine.
I know they tell you 90 minutes for DME but we've usually done it in 60.
Even if you're running a little slow, the place to check in luggage is near the drop off point and you can quickly drop and run.
I find buses better (timing wise) at AKL too.
I'd do it.
We arrive tomorrow at 8:30am and are staying at All-Star Movies for the first part of our trip and have a 12:30pm lunch at Skipper Canteen...I'm good with it and I think we'll be fine.