Bonglebear, this is a stab in the dark - you either have or want a BMW? Preferably one with the xenon headlights that only drives in the outside lane?
What's wrong with slowing down to 220 kts? The alternative I guess would be to request vectors and more track miles behind the Easy so you could maintain your 300kts or whatever.
Face it, it's generally going to add a minute or two to when you touch down. Your clientelle will be too smashed to notice and unless I worked for an airline that paid me according to my arrival time, I'd really be hard pushed to care. In your case, it's hardly going to earn you a discount on the amount you're shelling out to your airline to work for them, so it's probably worth relaxing a bit in the air.
My advice would be, assuming you've got a few miles to spare behind the Easy, is to check out your photocopy of the airfield plates, the Easyjet will probably not vacate at the earliest exit, you do a nice fast approach with a carrier landing (It's the winglets, I know I know), you can hopefully get off earlier than him and take him on the taxiway or the apron.
Sarah, you're right in what you say. There is no gain, looks like a net loss of 110 kgs to me. Sounds like the first Easy didn't have the capacity to assess the whole situation and the knock on effects of fuel flow to the other aircraft in the Rome TMA. Perhaps you might've volunteered some advice over the radio and provided some much needed guidance?