> in the last 18 months I've substantially increased the % of net worth I'm comfortable allocating to a home, reflected in both purchase price

And in the past 18 months, the changes to interest rates mean that your budget on a standard 30 year fixed has shrunk by 40%. That is, the same payments will get you 40% less house at 20% down. To make up for that, you would have to increase both your down payment and monthly rates by 66% to afford the same dollar value as a year ago.