Another corny question

I brewed a Fullers London Pride clone (AG) this Saturday, and the gravity has dropped over the last 4 days from 1038 to 1014. I have just racked it to secondary fermentation bucket with an airlock.
My question is: When should I get it into the corny? I am going to fine it maybe 2 days before transferring it to the corny to make sure it is nice and clear, but am unsure how long it should spend in the bucket before racking it to the corny.
Also, with the corny, is there any advantage to giving it priming sugar (or should I give it some sugar now in the second bucket?) I can pressure it nicely with CO2 once it is in the corny but didn't know if it helps the flavour providing some sugar and letting it do it itself

Cheers,
David