Oh, one piece of advice that's been given to me but that you might find useful: Don't neglect the easy tsumego. Do them, even if you can solve them on sight, just to keep the patterns fresh in your mind.
Secondly, strongly consider dropping 10 Euro (or 15 dollars I think) on EasyGo. It has around 2,000 problems of various levels including Life and Death and Tesuji problems and basics problems on everything from capturing stones to the squeeze tesuji. It's a very, very useful app for drilling tsumego and will give you a break from SmartGo Kifu's problems. It keeps stats on your attempts so it'll help you figure out which problems you're having trouble solving.
Also consider 501 Opening Problems on SmartGo books for the iPad. It's very reasonably priced and since you like tsumego...
Regarding lectures: Opening Training as per your level, Basics Course and Invasion for kyu players are ones I've found helpful on the topics you mention.
Bear in mind with all the above that I'm 3 stones weaker than you at least.
First go goal: stable mid-SDK by September
Re: First go goal: stable mid-SDK by September
Oh yeah, forgot to mention one thing. I think you should consider increasing the number of games you play per week by as much as possible.
Re: First go goal: stable mid-SDK by September
Got it nyuubi. First change to my schedule: I will play a lot more games and study a bit less. Maybe 10-12 serious games a week (1-2 / night), perhaps more, and 1 hour of tsumego/1 hour of tesuji each night.