Your the DM, do the XP however you feel it's warrented. If the half-dragon player is too strong then don't let him level.
Additionally I don't think you should ever have allowed a half-dragon. You were swindled and players really shouldn't do that to GMs. Yes he went along the letter of the law but broke the spirit of it. I'd talk to the player about it.
If you want to do an 'in-game' thing sap away his dragon powers and make him work towards getting it back. Templates don't matter 'quite' as much in the higher levels and you will have a nice plot hook for awhile.
My 2 cents.
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XP awards in PF doesn't scale or adjust based on level like it did in 3.0/.5. A CR 1 creature will give 400 xp regardless if the recipient it level 1 or level 10. A lower level character will certainly level up faster than a higher one just because the thresholds are narrower, but the actual xp gap between the characters won't close.
That is unless you don't house rule changes, of course.
There are no rules to take away a template, it's completely in the realm of the GM.
Just a quick thought - have the BBEG 'steal' the powers to use them himself. How he does it is up to you and without knowing more about your world it'd would be hard to give specific advice.
In terms of XP as BBT mentioned you could simply not use it. Level the group as appropriate, but some groups like having XP so it may or may not work for you.
Don't worry too much about the XP gap you already have. Even if nothing changes, what seems big now (+/- 4,000 XP) will be trivial when they're all 10th level. This will work itself out, as long as you don't keep letting the problem get worse.
To that end, you should probably try to minimize situations where some players find ways to gain XP faster than others - if they continue to do this, then even when the group is mostly 10th level, some will be a couple levels ahead because they continuously milked the system to get extra XP (and they'll have way more than a puny +4,000 XP to show for it).
It sounds like you are giving "roleplay" XP in addition to other XP for things like combat and such?
You should be aware that this is often a bad idea that looks good in theory. In theory, handing out RP awards to individuals who RP the best seems to be a good way to encourage RP from everybody, but in practice you almost always have good RPers and bad RPers and players who don't want to RP or just aren't comfortable with it, so you end up with the "stars" gaining more XP than the rest. It really only works when the RP awards are fairly small. Handing out 10 XP here, 20 XP there for entertaining RP won't usually create a huge imbalance, but then again, if the idea is to incentivize RP, awards that small might not be enough incentive.
Or to put that a different way, if the incentive is large enough to actually motivate RP for the sake of getting that XP bonus, then it's also so large that it will create imbalance between PC levels.
As for your half dragon, just inform the player that you allowed him to pick an overpowered race, but you have realized that it's not fair to the other players that they all have to be his sidekicks, so from this point forward you are housruling that his character gains no XP while his adjusted level is higher than everyone else - as soon as at least one other PC reaches the same level as the half-dragon's adjusted level (counting his +2 adjustment), then he can start earning XP again. That should solve all your worries; he'll only be overpowered from now until the rest catch up and then he'll stay even.