Cobras have a bit more offset than the Hogans would I imagine. That would explain why things change when hitting em. Also the Hogans will be a bit more difficult on the miss hits.
Drivers are so fickle.

I swear at times I can hity mine a mile. Other days it wont go for crap. Who knows.
Heres the most important thing you need to remember when shopping for clubs. The SHAFT is the most important part of the Golf Club. Once you find the head design you like to look at no matter the offset or not. One that is pleasing to look at all the time , then the shaft is the motor. It is what becomes IMO the most important part of the club. Heads will be hads as long as you like to look at em. But the wrong shaft and the head dont matter.
I would suggest , that if you want to be serious and get better or really better ,to go get fitted. By that I mean , go to a Golf Shp and get them to get you the lie angle you need. Also get them to check your club head speed. Different shafts do different things.
Mid-Kick Shafts , Higher-Kick Shafts , Low-kick shafts. Senior Flex , Regular Flex , Stiff Fless , X-tra Stiff flex. Graphite , Rifle , Stepped. Combinations af each. Its mind boggleing at times.
Get with a Ping Rep. (Even if you dont want pings) and see what you lie angle is. See what shaft would best suit you according to your swing speed and ball flight. ALSO see what shaft will get you the ball flight you desire for trajectory. High , low. High long irons and lower short irons. Yadda Yadda Yadda. I think you get the point.
This will help you in your buying efforst and what things to look for when buying.