Sounds like youre heading in the right direction, Dan. Im glad you enjoyed the coffee and its great to hear that youre not seeing channelling in your lab.... Im using LM triple baskets and overpacking- circa 21gm. You can throw the 30ml/30 sec rule out and go for a really slow squeeze. Ive had great results in the 60sec region. Experiment with grind and enjoy! *;D Larger bubbles can occur due to increased oxygenation of the shot. You may like to have a look at http://malachi.coffeed.com/naked.html which has some great info shot sequences.