Thanks for the comments!
Having ridden on the tubeless tires for the last week, I think I may have a problem with seating or the sealant - I seem to be losing more significant pressure than I initially thought. My tires were down by about 25-30psi over the last 3 days (without riding the bike for 2 days), which is clearly too much.
I do have farily rough roads to contend with, and I'm wondering whether going over a big bump (pothole or speed-hump) could cause the tire to "burp" and allow air out from the side?
Should I try increasing pressure to reduce the likelihood of this? I'm currently aiming for 68-70psi front and 75-78psi rear.
Any suggestions for how to determine the cause of the pressure loss?
What's nice is the fact that even at 40psi, I can still ride home without worrying about pinch-flats :-)