We've been talking about why players de-level in a couple of threads now and I've been looking towards a solution that would work better for this. The main reason for de-levelling seems to be to contribute more guild xp towards your guild as the reduced xp at the end of content also adjusts the amount of xp that is contributed.
Rather than nerf stats and/or xp as previously suggested, I think we can keep this aspect of the game (i.e.. contributing to your guild) without impacting other aspects of the game (bounty board, medals etc.) by simply removing the sub-levelling reduction from guild xp. What I mean is you would get a guild xp contribution based on the xp you would have gained from the creature before any reduction is applied for sub-levelling.
What do you think?