Well I actually had a very similar problem regarding SC2 ALL IN 1 launcher and the StarCraft 2 beta. I would A either be pit up against AI's who would practically stand still in their base with very few structures and no challenge to defeating OR on insane AI I would face off what I would like to refer to as a ass-raping machine. I never was able to find a medium spot but I got Insane AI to work by fiddling with the Cache folder and following the exact steps given on this page: http://sc2.nibbits.com/assets/starcrack-allin1/