I carry everything that I want to. I end up in the 11-15 disc range when playing a full sized course...less for pitch and putts. I could do with a few less, but I like having multiples to tee off with if I want. Not really anything else I'd want to add, except sometimes I add a lightly seasoned Quasar in between the two I regularly carry for really long courses. Current setup...
A putting Ion.
A driving Ion.
A driving beat Anode.
Light, seasoned Tangent for turning mid.
Neutron Axis, straight mid.
2 test Tensors of slightly different degrees of overstable.
Amp as an understable driver.
2 Volts as my go to line shaping driver.
Shock as my go to overstable driver.
XXX for certain utility shots, extreme winds etc. Shock used more but it still has some uses.
Beat Quasar for max D understable.
Fresh Quasar for max D stable to slightly overstable.