So after reading everyone's comments (thank you all!) it seems like the smartest plan would be to upgrade to an AP since I'm already looking at 10 days worth of park time and we had booked POFQ with park hoppers for 6 of those days. Would it be best to do this upgrade at the park in February to max out the time value of the AP or would it be better to upgrade before this year ends to beat a price increase? Gut instinct says the former to maximize the timing in anticipation of a, probably inevitable, third trip in late 2018/early 2019.
If I upgrade at the park do I do so on that first day through guest relations? What's the protocol here? I've read a few other posts but I am left more confused than assisted since I am walking blindly into the realm of ticket upgrades...