My favourite FL is about 10". I have an (uncoated) 10"/6.3 Conley Anastigmat Ser.V (Alphax shutter).....same as Wolly Ser. I, I think. Benefits from a good matte box and the round aperture makes for great OOF rendering, can sometimes be too sharp for some portrait situations though at small apertures and therefore gets used wide open to f8 a lot. I also like the 4x5 Wolly Teles 10"/4.5 (I only have the 15"/5.6 version though, for 5x7). Have you tried your 210mm though?