I like MinePeon, I really do, but I've given up on it.
The Pi just isn't fast enough. It can't proxy and run USB miners at the same time. Even with the DLink 7-port which is considered to be THE USB hub for the Pi. First my Block Erupter dies, then eventually the Jalapenos give up. Of course, the NIC on the Pi is USB, so that craps out eventually too. It's not a power issue, everything is running off a 750W ATX PSU.
Everything runs perfectly when attached to my TPLink router running OpenWRT with bfgminer 3.8.1 on it - the only difference I see is the TPLink's USB isn't broken, and it has a proper ethernet interface.
I'm still keen to test the BBB version of MinePeon, too.
Those D-Link hubs may be your problem. When I started it bought several D-Limks, was never happy with them. Sold them and replaced them with Rosewill 500's, no more usb trouble. I understand you can't get Rosewill in the UK, maybe ship from USA.
I have 8 Rosewill hubs, a BE 49 port hub and a few V2 Blades, all run happy on Pi.