Akshi,
if you have a good frequency planning tool available then the obvious choice is to shift to fixed frequency / BBH and it would certainly help. and I would assume your network is contained else its criminal to use 1×1 in an un-contained network, if your inter-site distance is less and your tilts are 0 to 3 with high heights like 45m above then probably you need to contain the cells as well and again a good planning tool can be of great help in this phase else check your RMS/CTP /TRX data..which vendor are you using?