Don't worry about the chronograph, IMO.

As for the broadheads, you're asking for trouble by shooting groups with them. No need to ruin arrows and heads by hitting them together. I only take one shot at a time with broadheads, no groups. If you end up hitting your other arrow, you could break a broadhead inside your target, and then you have that piece of metal in there for good. At least your gear seems to be shooting better. Now make it worth the effort on a deer!