Thanks everyone for the compliments; we were pleased with the race course, lots of variety, plenty of passing zones, and a memorable challenging climb.
Regarding the log crossing technique - I became good at log crossings many years ago when I had a "private trail" peppered with many large logs. Practice, practice... put some logs / boards in your yard if you need to.
At moderate speed, pop a wheelie just high enough to touch the top of the log with front wheel... get up off the saddle, and just after you contact the log with the front tire, shift weight rearward, push the handlebars forward/downward, and let the back end bounce up and over the log.
FYI this is a similar motion to a bunny hop, which is the coolest way to clear a log crossing, but the log will "help" get the back end off the ground.