Worth a try!
A slimline with four lines to four receivers could well be more efficient than attempting to power one line from a PI. For sure the signal from the 99 & 103 will be lower that the 101 (SD) sats.
Another thing to try is the eq offered at Solid Signal, Centronics or Skywalker. They may have something to boost things. Their staff guys live and breath this stuff! These systems are used in large buildings served from a single dish; must be possible.
I did encounter a guy who moved his house....had a fire and during the rebuild he flipped the plan to put the e meter and kitchen in a good LOS. Must have also happened in a TP somewhere.
Joe