D'Addario are already one of the smoothest roundwounds out there so it's either a nickel allergy or you really don't like rounds.
DR Hi Beams or Fat Beams are the smoothest steel strings you can buy.
GHS Pressurewounds are a good alternative to nickel roundwounds.
Starting a Doom band.
Usual drop C sort of stuff.
Spark Booster, Blower Box, Big Muff.
Struggling to think what else I would need except a massive valve amp?
Ta.
Chromes are the brightest flats out there. If you need brighter still, I would say try Pressurewound strings. GHS Pressurewounds and SIT Silencers are good examples.