ime 60mm is too much of a drop, to retain handling and keeping it driving properly I wouldn't drop more than 40mm absolute max.

You've done a whole load to the car already so bar maybe adding a performance panel filter or induction kit I would stop and just enjoy it. And I know you don't want to be told to buy a Zetec S or ST but to be brutal you would be better doing just that. Don't need £5-10k as they are cropping up for as little as £2500. Lots faster and would probably be cheaper to insure than your 1.4 with loads of modifications on it.

Best of luck with it though