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 Switch
DPP = DishPro Plus, such as , DPP Twin LNBF, DPP44 Switch,
- Legacy receivers uses a change in voltage to make the legacy LNBF shift polarity.
- DishPro uses DiSEqC commands with a 22KHz tone riding on 19 volts and as low as about 10 volts, and sends both polarities at the same time by bandstacking them.
- DishPro Plus is the same as DishPro except, a dual tuner receiver can receive 2 satellite signals at one time on one cable, i.e., one sat signal for each tuner.
So it sounds like you have a DP Dual LNBF on one dish, and a DP Plus Twin on the other dish. That DP Plus Twin allows you to run a single cable to your 722 Dual Tuner Receiver.
As OSU1992 said, if you put the DP34 in the mix, you may decrease cable distance between each end, but you will need to run 2 cables from the DP34 to the 722 which may require more total cable (but may be less cable out in the open).
However, if you were to put a DPP44 in the mix, then you would only need to run 1 cable from the DPP44 to the 722.
Please note the correct use of DP and DPP which makes a big difference.