I play 6's , 7's ..and just got my 8 string..it needs new pups bad..it comes stock with EMG's only problem nobody makes an 8 string replacement pup yet.
i have one of my 7's in drop A.
Which 8-string have you bought ?
And by the way,there are 8 string replacement pickups available.
There's the Lundgren M8 and a guy i know in Australia even has a pair of 8 string BKP Warpigs that Tim made for/with him.
He had the bobbin faceplates machined and sent them to Tim and he did the rest.
I'm another 7 string player but i do still play my 6's too (tuned well low).