Are you gigging your 1st Gen Fury at all? i have rounds on mine and i need to change to flats, likely Fender 9050s but thats all ive used for flats on my Peavey basses...my 90's Foundation 5 sounds great with rounds tho and it is a great bass tho i had to redrill/reposition the bridge as it was off just enough i couldnt correct it...other than that it is stellar imo and all i need in a 5er (other than my Dean fretless 5er).
I also changed the bridge on my 90s Foundation 5, but not because the original wasn't properly located - I wanted slightly wider string spacing on mine... I used a MIM Fender 5 string bridge, and it duplicated the spacing/feel of my EBMM Sterling 5 HS... I also agree that the Foundation 5 is all I need in a 5er, and I've gigged mine hundreds of times - even though I still have the Sterling 5 HS, a Spector Legend 5 Custom(neck thru), and a Schecter Hellraiser 5... The Foundation 5 plays as well as any of them, and sounds great - it's the only passive 5er I've ever liked... Truth is, there is nothing I can't get done as a bassist with the 3 USA Peaveys I own...