Hi Kurb, I certainly don't recommend taking the engine out again to clear the PCV oil return - it is just something that in my opinion should be done whenever you have an engine open and have the slightest suspicion about the ventilation system. The process I use is to hold the drill bit in my fingers and push it in about 5/8", then pull it straight back. You usually feel some resistance as it reaches the far end of the drilled hole, then it breaks through and you feel a springiness as the drill bit presses against the woven mat. You pull it straight back without rotating it, or the drilling flutes will entangle in the mat, and you'll then have to rotate it anticlockwise a bit to get it out. It is just a ritual I tend to go through, to ensure that something is not wrong. If I wanted to do it once the engine is reassembled and back in the frame, I'd do it from the top, not the bottom. You can remove the top cover/fuel tank, the starter, the flywheel, the top cover of the PCV compartment, and the oil separating mat. The top end of the drain hole is then accessible from above. However I don't propose that you do this, since there is not enough evidence of a problem.
I'm not entirely convinced that your PCV drain is clear, I just don't see it as an issue since your breather hose had no oil in it. To give you an idea of how well the system drains when it is working properly, though, here is something that happened to me 3 months ago with a GXV120 engine I'd just put new rings in, and reinstalled on my favourite mower (a 1980s HR194). I parked the mower near the edge of a slightly raised concrete area while I emptied the grass catcher, leaving it idling as I always do, and heard a crash from that direction while I was emptying the catcher. I looked around, and saw the mower exactly upside down, having fallen off the raised area (must have rolled a few inches I guess). It was still running perfectly. I walked over to it, put it back on its wheels, and went back to my catcher emptying. It continued to run perfectly except that it smoked heavily for about 15 seconds or so. By then I'd finished my chore and resumed mowing, with no remaining symptoms from the adventure. Essentially, the PCV compartment filled with oil while the mower was upside down, and when I righted it, some of that oil went into the breather tube while the rest of it went through the oil drain passage back into the crankcase. Gas flow through the breather tube took the oil with it, through the interior of the air cleaner, carburetor and intake pipe, into the combustion chamber where it was burned up with no harm done.
