After a great deal of reading,mostly older threads on SMC,along with advice from a more recent thread and many hours of hair pulling I am finally able to repeatedly split a line ripping full depth,(it only has a 13 inch deep capacity)The blade wasn't changed.
I was satisfied there were no issues with the motor,bearings or wheel alignment.
What I did do was a slight tracking adjustment,realigned the fence and cranked up the tension.
I also found the table wasn't square to the blade in the fore and aft plane,ok in the left to right plane.
And guide post was significantly out of alignment with the blade in both axes.
This took a great deal of fiddling to align,and to align the guides in the meantime as in it's life prior to my ownership the guides had worn unevenly.
The one thing I haven't been able to get a definitive answer on is regarding the tyres and whether they are crowned or level on that model.Even Centauro can't seem to confirm that...
So I'm just working with what I have,which is crowned and fairly new.
I did get a price for tyres however...$1000 delivered!
So thankyou to all who have made suggestions recently and also other more ancient threads I managed to dig up.
SMC is a great resource. 👍