I can understand you feeling that way Rich, it really has gone on a bit too long, especially as in most cases you've never actually been sure it was fixed, when a problem went away.
In my case it's been so easy to stick with the Falco as -
1) It's the best bike I've had in 46 years riding and,
2) It's the most reliable bike I've had in 46 years riding.
In more than 7 years and 26K plus miles, it has only really had two problems, broken plastic pin on the side stsnd switch and buged up brake light switch.
I also had the problems related to the dud Yuasa Battery, which I initially put down to the bike.
Then there was that extra special "Numpty" trick of putting the tilt switch in upside down, because I knew there was one but thought it lived under the side panel not at a 45 bdgree angle at the side of the battery, plus the rubber housing clip allowed it to be mounted two ways, (and I chose upside down).
It cost me a few parts before I came to my senses!
In your case it was always going to be difficult buying another Falco having had the previous one that was special.
I would not rule out another one, but better luck with what ever you get.
Am being boring, but really nice ZX9Rs are going at even sillier prices now!