Collectors and speculators are not too "hot" for this set or these coins. They are more bullion strikes, at this time. Do not get wrapped around the axle about them being "low mintages" at this point. Just find them for bullion price and add them to your collection. Eventually, speculators and dealers will catch on and freak out. Until then, just go with it.
For quite a while, I had mistakenly thought the First Spouse coins could be minted throughout the twelve (12) month period of their release. I later learned that the Mint (by law) can only produce the coins during the calendar year inscribed on the coins. This means that coins such as the Margaret Taylor and Mary Lincoln (both released at the beginning of December) are the most difficult for the Mint to estimate. The Mint estimates how many they are likely to sell and that's how many they produce. The Mint has stopped (apparently) minting the Maximum mintage only to have a bunch of leftovers to melt later on. I suspect the Mint has been burned a few times with the low sales numbers. You can use the most recent Uncroof ratios to gestimate how many of the Proofs remain to be sold. However, if you need a coin to fill out your collection, it might not be wise to wait too long.