I don't think your spending enough time exercise/training.
I have a czech/ddr , and at that age, she'd be bouncing off the walls if I had only spent that amount of time with her daily.
It sounds like you have a busy schedule, but I think unless you start exercising more, and enroll in an obedience class , you are going to continue seeing issues.
He needs consistency, exercise, obedience training and more time spent with you doing those things.
You said there isn't much you can do, maybe with your schedule you can't, but honestly I think if you want to be able to live with this dog, your going to have to committ yourself to devoting more time to him..Just my opinion..
Danger Danger vom Kleinen Hain aka Masi
"Angel" Jakoda's Bewitchen Sami CD OA OAJ OAC NGC OJC RS-O GS-N JS-O TT HIC CGC
"Angel" Steinwald's Four x Four CGC HIC TT
"Angel" Harmonyhill's Hy Jynx NA NAJ NAC NJC RS-N JS-N HIC
"Angel" Jakoda's Jagged Edge