Pupillage rejections – second time lucky?

This will be my second year of pupillage applications – is there anything I can do to improve my chances?

I passed the BPTC last year with a competent (just missed out on a very competent) and am applying to chambers with a broad civil practice. I have a 2:1 from a decent university and I managed to get two first interviews last year. I have done mini-pupillages, mooting and a bit of FRU.