Non-Sanded Grout by Polyblend would be a better option for filling any holes.
Yeah ditto....use the non sanded grout for bug holes. Still not sure if you can use the sakcrete by itself. Are you adding fiber to it? I guess you would have to use more rebar then what you are showing in your picture And if you use it without any polymer, your curing time will be way longer. I think its a 28 day curing time..just like regular concrete.