I also wonder if this could be made worse by the oil return tapped into the pan.
It leaked very little oil before last oil change, now after the oil change its really pushing lots of oil down the intake filter tube. This sudden change may be caused by the oil level in the pan is sitting higher than the return line. Whereas prior to oil change it was probably sitting a bit lower in the pan.
Hell maybe I should tap the block to get the return up higher...although I would hate to do that