From what you have so far, I'd say Black Hawk.
I use the same pickups in my Les Paul Studio and I know exactly what you mean. I really like the 498T but the 490R? Not really! The thing that would concern me is that if you like the 498T so much, why are you going for something that is going to be so radically different? The nearest thing to a 498T that BKP do is the A-Bomb as it has that gritty, aggressive hairiness that only seems to come with 43PE wire wound hot. The Bare Knuckle pickups that are supposed to be hotter 'Metal' pickups like the Miracle Man etc. generally use polysol wire and while it seems to retain articulation very well etc. the pickups lose some of the edge. I found the Miracle Man to be a lot more polite sounding than I had anticipated and the same was true of the Holydiver. I assume (I may be wrong) that this is simply a by-product of the wire used. The 498T sounds hotter, tighter, more aggressive and more saturated than most of the contemporary Bare Knuckles I've heard and it's one of the reasons I'm so loathed to change it.
So, of the two you seem to have narrowed it down to, I'd go A-Hawk but if it was me, I'd be looking at an A-Bomb for sure.
Good question about the 498t I did like it but I wanted some thing even more OTT, fancied open black coils and refused to believe that there werent better pickups out there :)
The Duncan distortion suits me in many ways but clarity could be much better and the cleans are awful.
Slarti as you know we have completely different take on the alnico nailbomb. Whilst its tight for an alnico pup in my alder super strat its no where near as tight as the Duncan Distortion is in my les paul. The distortion is so much more 'helpful' when playing fast and technical thrashy/progressive riffs and whilst the alnico nailbomb is my favourite pickup ever thus far I think its 'warm top end' would make it so it didnt have enough cut in a les paul for my tastes. Jonathan from Feline also felt the alnico nailbomb would be too dark in a les paul for his tastes. You obviously like a 'smoother' sound in general to me. I think the ceramic nailbomb is an option but BKP told me to go for the painkiller!
Top and bottom ive gained an appreciation for ceramic pickups (In the bridge) again.
Several people here have recommended the Painkiller as have BKP AND Feline Guitars so I feel its too much expert advice to ignore.
Ive always liked the sound of the painkiller and its nasty nature with its string to string clarity it reminds me on the nailbomb but ive always took a lot of notice of the people who say the painkiller is on the brighter/harsh side and has no balls. What ive also noticed though is people who put it in mahogony get a lot more joy with it and this les paul I have is on the warmer side for sure and some people say its a nailbomb at the next level......some also say its not as beefy as the nailbomb and some people on this very forum have said its not as beefy as the duncan distortion. Theres onyl so much attention you can pay to people online youve never met before though!
I personally cant decide between the alnico black hawk and the painkiller on my limited experience but when the majority of people are screaming PAAAAINKILLLLLLER at me I cant ignore it and its a pickup ive always been interested in any way just weary of.
EDIT - At the start of the world cup I put money on Germany to win. At this stage it looks like a sure thing so if they do ill treat my self to a painkiller ASAP!