Our last 3 coaches have pretty much been equally bad on the road, and not really that good at home. In conference games only, all 3 hovered around .500 at home (which is not good enough) and around .200 on the road. Wooly's deal was he was nearly equally mediocre every year, Altman and Asbury had a couple solid years (NCAA teams) and a couple horrid years (2 wins in the league) to even it out.
A reasonable goal to be a contending team is .800 at home and at least .500 on the road. That gets you around 10-6 every year in the league.
As far as the problem, I'd say its mainly the inability to maintain a consistent talent base to compete year in and year out in the Big 12. Both Altman and Asbury were able to put together one season with a stud JUCO PG and transfer PF with reasonable talent mixed around it, but other than that their recruiting was actually worse than Wooly's IMO. Wooly was never able to put that formula together to make a legit run in the league, but probably recruited consistently better talent (still not good enough) and was also plagued by the transfer issues. None were Big 12 caliber coaches during their time here and only Altman has been able to find a niche to succeed in.