Thanks ady2650. Garry got some clarification over the use of cavalry wedges in HC from Rick:
"I never imagined cavalry using the wedge rules - the wedge rule is there specifically to represent the kind of breakout formation described by Caesar - and I've used it for Roman legionaries by arrangement for games involving Romans - but not usually for straightforward 'line 'em up' games where I think it can be unbalancing - at least as written up anyway. The same goes for the testudo - we tend to use this for assaults and not in the general run of play.
The powers that be (if that is me) says please do as you will - as there is intentionally plenty of scope in HC to have the rules reflect your own interpretation of how ancient formations worked - I'm not a great fan of cavalry wedges to be honest because I think they look a bit messy (yes I know...) but - just thinking rules wise - were I to want a cavalry wedge I would suggest just stick to:
Free move Enemy giving ground are burst through Can make 3 moves after enemy defeated/burst through
That alone would be hugely powerful - and that last one makes me a but nervous as a triple cavalry move could be very nasty.
The +1 morale, counts front all round, front all round for ranged attacks, can attack all round, and no support - are all there to model a closely ranked heavy infantry formation as described by Caesar - there's some good discussion on this by re-enactors on the RAT (Roman Army Talk) forum - and the rules were largely developed from the formation as discussed."