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+1 on the blow by and catch can suggested above
You will have blow by with pretty much any forged piston regardless of gaps as is the nature of them, so I would just go with manufacturers specs
I recently built my own engine, I had the machine shop gap the piston rings to JE spec, I have a little blow by on startup but not too bad and my catch can setup is easily dealing with it.
For the rod and mains clearance I went with OEM tolerances using King XPG, I was aiming for 300whp (supercharged) and wanted to do as much as possible to maintain oil pressure.
There is always a tendency to increase bearing clearances as power increases but many believe a smaller gap actually help maintain a better oil film/ dynamic wedge and it also results in a the better bearing loading, of course that varies depending on a number of factors. Just food for thought I guess
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