Well the reason I asked that way Is you mentioned that one of the reason you used the overwatch is because a lot of players you play with use fast and light meduims. And those fast units that can flank are a major way that you can deal with campers by getting in the rear arc. But in your case you have the overwatch rule as well. So I would suggest not using the overwatch rule and let those speed guys do what they do to deal with campers if you don't want artillery in the game. I know you said the overwatch feels like it speeds your game up. And you are right because if you take away the ablity to flank campers your enemy has problems.
What is the "overwatch rule"? When I said we play with overwatch units, I basically just meant we park mechs with ranged weapons in suitable terrain and use them as snipers (or "overwatch"). And, yes, you're correct, fast mediums and lights make life tough for those units. But, IME, a good counter to fast movers is to park a big boy and pull better firing equations.