In my opinion, all of the Nottingham tonearms sound best when used with a high compliance cartridge; that is, over 20cu or more. The compliance on your Delos cartridge is 12cu, which would indicate that it may not be the best match for this arm.
Cartridges I reccomend, based on my experience with the Nottingham SpaceArm include:
1- AT440MLa - the only MC cartridge I liked with the Nott arm. A lot of bang for the buck, but I prefered the Ortofon or the SS
2- Benz Ace SL - sounded very good, but not as good as with other tonearms
3- Grado "The Reference" (original version) - very nice, although a little light in the bass region
4- Ortofon 2M Black - the best match, for my rig and ears. Very neutral, works well for all music genres
5- Shure V15/IV - sounds very good, but not in the same league as the Ortofon
6- Soundsmith SMMC1 - high compliance version, sounds great. Warmer, more detailed but less musical than the Ortofon
Cartridges I reccomend, based on my experience with the Nottingham SpaceArm include:
1- AT440MLa - the only MC cartridge I liked with the Nott arm. A lot of bang for the buck, but I prefered the Ortofon or the SS
2- Benz Ace SL - sounded very good, but not as good as with other tonearms
3- Grado "The Reference" (original version) - very nice, although a little light in the bass region
4- Ortofon 2M Black - the best match, for my rig and ears. Very neutral, works well for all music genres
5- Shure V15/IV - sounds very good, but not in the same league as the Ortofon
6- Soundsmith SMMC1 - high compliance version, sounds great. Warmer, more detailed but less musical than the Ortofon