I can't imagine either 160 Grizzly having any strength issues.Both should also fly well.My 190 and 200 El Grandes often fly better than my field points.I don't know why that is but it is visible.
If you mount them so they spin perfectly and the arrow is tuned to your bow,they will fly as well as any point.With a simple homemade or store bought spinning jig,they can be mounted with the point perfectly centered.Form,this has made a huge difference over just spinning and eyeballing them as I did in years past.
It was a little bit of a learning curve getting the grizzlies sharp but I'm getting the hang of it now.The video posted earlier should help with that.I like mine to be a very honed and polished edge.It is like sharpening any other blade in that you just keep honing until you have developed a burr,full length of the edge,then remove the burr.
The trick is to stay with the coarsest stone or file until that edge is developed,full length.The grizzly is a tough broadhead that will hold an edge well.It is worth taking the time to figure out how to get them super sharp.There is plenty of help available on this site to help you get there.