Sounds like a nice running saw! The fact you actually use your saws gives you "enhanced" insight. Empirical data is by far the best way to measure the changes in your saw in your world. Keep learning & trying and try not to over analyse as that has stymied many...
I need to do another video since I advanced the timing, I shaved .015 off the key and I was talking to MG porting we believe my intake is low I'm getting of fuel/oil back in air box. It is probably where I swapped out to a pop up piston or It's always done it and I never payed attention.
Also I was reading an paper study on various porting methods. I spent the last 10 mins trying to find it with not luck. To summarize the paper the writer could only do air flow models do to his hardware limitation. So he was doing a direct injection model. With understanding that a carbureted engine could show different results.
Slick was fastest for air flow ( However he mentioned with a carburetor set up it would hender due to drop out)
Machine was a slower (But mentioned it would be best suited for fuel/air)
Dimples were interesting with various drawbacks. But not so clear cut.
At lower speeds dimples caused turbulence slowing down the velocity (Which was mentioned to prevent fuel drop out but he couldn't show it due to his hardware limitations)
The part which I'm more curious about is at higher speed. He said for airflow dimples where more of a hindrance. The whole theory of dimples is that it creates an air layer so fuel cant stick to walls or the air would move faster since it had a boundary layer. But that boundary was the problem decreasing port diameter choking how much air can move. (Since porting a 4 stroke isn't about blowing it up to the largest it can be it's about getting the port as straight as possible.)
This part interested me where I widened the transfers slowing down the velocity at lower speeds leaving more chance for drop out. I could put dimples in it getting the chance to reintroduce the drop out back into the mix then at higher speeds getting a tighter port to increase velocity in the transfers. However this is all theory to me. Unless I try to spend time and money to do a computer model. Not to mention the real world results would probably be in the gray area if it did anything or not without a dyno.
He finished off his study paper by talking about real world vs computer models. Computer models give us a really good idea about what is going on. However they are not always concrete evidence since the real world can have a variety of conditions. These tests were comparing ports of equal design all polished, all machined, all dimpled. Mentioning that maybe in a carbureted engine It could benefit from dimples in certain areas such as at the the end of a port or at low lying areas to give a point to throw setting fuel back up into air before entering cylinder.
If anyone knows this article and would take the time to send it to me that would be great. I think it was written by UNOH student as his graduating paper.