Agreed, although it's hard to see what can be done to increase the conviction rate. Juries can't convict unless the evidence presented is convincing enough, sadly. Also, of course, Juries can't explain the reasoning behind their decisions in specific cases, so it might well be that there is an (accidental) bias against the complainant that increases the likelihood of a "Not guilty" verdict regardless of the evidence.
Still, some progress can be made. Better and more complete forensic analysis, where possible, can be highly convincing and is certainly more reliable in general than eyewitness testimony, so would be harder for a jury to reject as compelling evidence.