There are some physical factors that can make cruisers a bit harder/slower to handle. Generally the wheels, especially the front are bigger which creates a greater gyroscopic force and the rake of the forks which positions the front wheel further out in front of the handlebars and the clearance from the pegs or exhaust to the ground which can limit your lean angle. Some bikes can mask this better than others, my old Yamaha XVS Custom (Stryker in the US) had some clever geometry which made it look nicely raked out but handles better than it had any right to. Then there are bikes like the Ducati Diavel, Triumph Bobber and my new pride and joy the Harley Softail Streetbob which have insanely good handling, for what they are of course, not compared to sports bikes. There are some things you can do. Look at your tyre profile. Often these bikes are supplied with a "square" profile. Makes them super steady on the straights but horrible to turn. Consider changing to a more rounded profile. Look up some videos on counter steering. Helpful on all bikes but especially cruisers. Finally, accept your machine for what it is. You love the lowrider style so embrace the lowrider lifestyle. The handling, like the flies in your teeth if you have an open face helmet is just the sacrifice you make for that feeling it gives you. Enjoy mate