Hi JB, we all go through slumps especially with the putter - so stick to the same putter, don;t blame the tools.
I am sure you understand the green speed as you have been a legend for long enough. Personally I like my own putter pal, it may not look great but works most of the time, well some of the time lol but worth while if speed is an issue.
When I putt poorly there is one reason and one reason alone and that is ball placement on the green. Make sure you know what spot to play to, being 6 feet away and having a 3 inch downhill breaking putt is harder than a 15 footer uphill. If you don't know the green use the chip mode and zoom in to find what part of the green to avoid rather than just trying to get close. The best thing each time you play a hole take notes of where you landed, the line the break and no nos for that green.
All I can say is enjoy the game and if you miss a putt, work out why and take notes to avoid the same putt next time around.