Hi Alistair,
The scope is a TAK TSA 120 and with the flattener it is F7.3 which is about 876 mm. I did notice 2 seconds made it better. The mount is an EQ6 Pro with belt drive. Polar alignment is good, I wouldn't say great, as trying to adjust it with those dicky altitude screws is very hard. Polar drift is veeeerrrryyyy ssslllooooowwww!
Sorry, no graph. Will try to collect one tonight.
Cheers.
