If you have solved this problem, that would be very good indeed, although only time and the experience of a number of users will tell.
I say this because this has been a long-running issue. Some people have had terrible experiences, and in the face of such reports, IJM repeatedly stated that the carts worked for them and most users, and if they didn’t then the fault must be a poorly maintained printer, or sawdust in the studio.
If this was the case then the carts should be guaranteed to work with new printers. That was true in my case, but poor old JeffG has had a terrible time with two new R1430s and one new R2000. I hope you will look kindly on people like him.
I assume that these new carts will be a lot more expensive than the old R1430 / R1900 R2880 carts.