Only problem I see with a reduced block support are crit flicker builds, but those builds will have to be nerfed at some point anyway. If they increased the pvp damage penalty a reduced block support would make sense and indeed make pvp a lot smoother.
If they reduced overall spike damage, Aegis builds like yours would probably benefit the most from it, so there needs to be something to counterbalance it.
..is not a support gem.
CT is not pvp for me and can't really be balanced, as it seems to revolve around catching people off guard. And a support gem wouldn't help much unless you get it from Hillock in act 1 norm.
~b/o 2 exa