I tried another set of bulbs, from Home Depot. R30 CFLs 15W, 65W equivalent. 2700K. I purchased dimmable because I wanted something as different as possible from the FEIT which were non-dimmable, not because I needed dimming.
Anyway, things only work right with 2 out of the 6 bulbs installed, which is worse than with the FEIT from Costco (worked with three).
I tried to let them warm up a very long time (10 minutes), but there was no way to turn them off via X10 at all. Not by IR543, plug-in RadioShack remote, or by RF transceiver. The "Off" signal was just not getting through. The IR543 only froze on a couple of occasions, so in this regard it was better than the other bulbs.
However, the noise was apparently so bad that I could no longer switch off the other lights on the other couple XPS3 in the same wall box via X10. The signals weren't getting there either.
So, with these 6 new bulbs, basically x10 was completely broken for all the lights in the room.
x10 still worked in the back of the room to turn the AV equipment on/off via appliance modules ...
I have put the FEIT back in place.
These bulbs cost $35 in packs of 4. Quite expensive. I bought two packs. They were in cardboard packaging, easy to return. Unlike all the other Ecosmart which are plastic that need to be cut. These 2 packs are going back to Costco.
My Leviton 6827 filters went back to Amazon uninstalled also.
Any ideas that don't involve an electrician or drywall work are welcome. Besides buying every brand of R30 I can find until one works.