I'm not sure if you would end up with better signals or not. However, if you are thinking about trying to eliminate some of that 320 feet of cable between the further LNBF and the 722, keep this in mind.
Legacy = Legacy
DP = DishPro, such as, DP Single LNBF, DP Dual LNBF, DP Twin LNBF, DP34...