I use a Uniden 396T and monitor in the New Hope/ Crystal area. I have done some tweaking with my p25 setting and seem to be getting better reception than before. I have found that coverage gets weak as you travel east through the New Hope Crystal Area, and have had very weak coverage from about 42nd & Douglas to Crystal Community Center while on Hennepin East- the two towers covering this area are from Hennepin Radio in Golden Valley and Hennepin Sheriff Patrol HQ in Brooklyn Center. I have had some luck using the Minneapolis system too.
I suppose that all depends on what kind of scanner you have. With my 396xt there is little I can do to actually adjust the P25 performance. Also, they do roam to the City Center Simulcast from time to time. Maybe try that?
If you are having problems with decoding, try the attune. Or if you are not getting enough signal, getting a new antenna is always a good idea.