PRESSURE B     [mv force + press]     P.mv - P.r = mv force
P.r is the pressure variable in the mv force.   A stiffer mv stack will produce lower P.r, resulting in higher mv forces.   [The greater the p.drop, the higher the forces]  [see bottom graph] 'mv force' comes from P.mv - P.r. --->  P.mv is dependant on the bv stack.  Remember, mv shim changes affect P.r, not P.mv. However, if P.mv increases from a stiffer bv, P.r increases as well.