Means do half the hop version and half the original version. That way you get the best of both worlds. Fair enuff. Personally, I wouldn't tamper with it, good enough on its own.
I'd try replicate it with an all grain twist or start over. In my honest opinion, pushing it to 9.3 % abv is pretty awesome. Pushing it in any sense is and would be awesome. Hopping it, pretty much ruins the idea unless you wanna listen to Pirate_Pete for some advice on this, personally, it's wonderful enough without messing with it.
There are more or rather less worthy porters that are in need of attention from extract brewing. Namely, the St Peters Honey porter which fails miserably at what it aims to do and is more likely in need of your brewers surgeon skills