I have an issue with trans to flex plate

Ok guys I’m not 100% sure of the converter year as it as an exchange reco one that was identical to the original and was put in as the trans was rebuilt as the converter was an unknown quantity and I did not want to have to pull the trans if it was faulty after the initial rebuild, now the engine and trans were rebuilt back in 2012 and as I stated the car had probably had 5000 miles on it since 2018 when it was finished and registered for road use.
The converter at its rear most position is inside the bell housing approx 1 1/4th inches and up against flex plate without bolts in approx 1 1/8th inches I would estimate maybe a 1/32nd or 1/6th more with the converter bolts tight.
There is no movement of the crankshaft forward or back levering on the balancer against the k frame or stabiliser bar.
The teeth on the converter have some marking from trying to get it to engage, see pics
This has come on suddenly and got worse very quickly, I can rotate the engine with a breaker bar and the starter will engage but after it kicks out it needs to be turned by hand again to get the teeth to mesh again

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