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But on the driver rear tire is Nankang Ultra Sport NON RFT and the other tires are bridgestone rft
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You really don't want to mix RFT and non-RFT. Period.
Not that I've tried, but others have documented the problems, and it makes sense given how strong the sidewalls of a RFT need to be.
One solution is to buy a Bridgestone RFT tire, of the EXACT same model (there are 3 with similar model names) with the same amount of tread as the one on the other side from Ebay. One without any patches or repairs. There are lots of these Bridgestones for sale there.
Or replace both rear tires. But stay with RFT of the same performance category as the fronts.
And secondly, Nankang. Probably the cheapest tire out there, with a name. I won't trust it.