Rhythmic smoke puffing out of oil input breather cap

[AnthonyG]

About a month ago Rhythmic crankcase smoke puffing out the oil neck intake tube started after I brought the rpm's up on a ride to blow out some carbon as I rarely drive the car very fast or hard so once in a while to clean it out before putting away at the end of the season I do. Engine is an 8BA 5 yrs old w 2000 miles on it built by United Engine Specialists Jerry Livingston, Wichita Ka.. It seemed to diminish after using Seafoam engine cleaner & compression was a bit better & more consistent @ about 75psi but came back a couple weeks ago. Checked compression again and found cyl 2 weak again 30psi to 95psi. This time removed right head to check cyl's for damage, saw none after a thorough inspection of #2 & top of piston & other 3 on that side all looked good. Also there is no smoke coming from tail pipes first time nor this time, exhaust looked fine. I can't think of what would cause this condition so I guess ill pull engine remove oil pan and check inside lower end? This engine has always had what I thought was a lot of mechanical noise but chalked off to the nature of Flattys as a novice to them. Any ideas or direction?