[TowerTalk] Antennas for SO2R station

[WW3S]

I live on a small lot, 80x180, in a subdivision....I have a 50ft tower 
with a 3L Steppir on it.....I had planned on putting another Steppir 2L 
about 7 ft above the tribander.....BUT......my current SO2R setup I'm 
using a Hytower as the second antenna.....the rigs are a 7610 and 
7300.....I have 5B4AGN bandpass filters on both rigs.....I'm already 
having interference issues between the rigs now, so I think moving a 
second antenna to the same mast is asking for more trouble. Just 
wondering if anyone uses 2 antennas on the same mast for SO2R? Also, is 
the 7300 maybe a problem? I heard that radio generates a lot of phase 
noise on TX, not so good in SO2R applications. Anyway, planning for some 
tower maintenance this summer, and looking for suggestions on optimizing 
the station for SO2R....