Doh, should have done this before.
Increased my AGI to 6, was allowed to have Riding 2 ... So it is Riding 1/3 AGI
HOWEVER... only allowed HA 1 with AGI 6. So HA = 1/6 AGI??
I was reluctant to spend as my attribute spread was such that I would have had to spend 12 AGI before to get 2 Riding which would have meant only 9 ST. Now I can have Riding 2, AGI 6 and STR 12 for PD4...
Hmmm, interesting balance from before in the way it affects horse riders. Prior to patch, any cataphract rider or above was a 2H whirling Dervish due to a high AGI requirement (about 30 or 36 AGI!). Now they will be AGI 15 or 18.
Looks like with the HA being 1/6 AGI, the whirling dervishes will be the dismounted HAs as no-one else needs it....
Unfortunately I'm still trying to make a HA so I'll post another topic on how I find that, post patch (i only reached the *heights* of PD6 and Riding 3 HA 3 with 18 STR and 18 AGI being level 29 - I'm now level 20).