Yes, a lower percentage means less force acting on the rear shock, but if you take the weight transfer during braking into account, which is the most significant and important part of mountain bike kinematics, a number closer to 100% actually maintains the suspension feel and geometry so that you retain traction on the rear tire and a planted feel on the bike instead of transferring everything onto the front wheel. The only time having lower anti-rise is beneficial is when you are braking on flat or uphill rough terrain. Hence the reason for keeping the anti-rise on "active" bikes...