Should a 175 be that hard to move? Broke a serious sweat doing a 10x10 area... I know it weights 2x the 360i but it seemed super heavy...
Should be easy to use a 175. It may take getting the handle set at the right height and then some practice. Enough product on the carpet to provide lubrication is also important.
The only hard part should be loading and unloading a heavy machine.