Oh, well....now I understand the difference between .043" pitch, and ,050" pitch. The new chains wouldn't slide easily in the bar, and it drove nuts until I did some googlin', and looked at Gen-You-Ine Makita chains vs the Brand-X chains I bought at Cheapo Depot. The Brand-X chains were poorly marked, and had no "Also Fits" guide on the package. Rookie mistake, I guess.
Proper chains on the way, and I can finally finish cutting up all the logs in the backyard. I'll go rent a splitter later in the year so I can turn them into easily digestible sizes for the fireplace.
The OEM chain got severely dull from cutting out some of the dead juniper bushes earlier this year. Cutting that stuff is like trying to cut steel.....tougher than snot, and rapidly dulls the blade.