How thick have you cut through?
I can only presume that pushing the block down and under must be fun the thicker the ice is?
My BIL has an old DVD of clips from up in Maine when they used to harvest lake ice for the ice houses, and the saws they used were impressive.
One was a large buzz saw that cut most of the way thru, and a had saw to finish the job.
Like most cutting devices, you need a sharp blade for the easiest and best cuts.