Well, it depends on how you look at the NACARA visas. I think DoS/KCC are planning with 50k diversity visas in mind and use NACARA only if they have to make some corrections to current quotas to meet the targeted ones. This happens at the end of the fiscal year. Sort of a reservoir.
If they wanted they could have easily issued more than 300 visas a day. They had loads of AP cases for months, plenty of time to get them resolved. They didn't. They just used as much NACARA as necessary, until the quotas were close enough.
So if 1450 was good for 3k - - because they messed up EU and AS considerably - -, but they actually wanted as little as possible, say 1.5k, the cut-off they had aimed at would have been 1450/1.06*1.03=1409 and that's lower than 1450/1.05*1.03=1422. Downscaling from 3k to 1.5k, instead from 2.5k to 1.5k.
You have never seen that many NACARA visas in previous years. Either they changed their policy regarding NACARA or they simply messed up. I tend to favor the latter. And I wouldn't bank on a replay.