Nice image, the data is definately there, but like i say for everything the difference between a good image and a great image is the processing behind them which takes years of experience and fiddling

. Keep up at it!
As for Alex's comment on the finder guider it will work. I utilize it and it works very very well. The finder that im using is the Skywatcher one and focus is easy as the front mirror cell is a focuser in anycase. as long as your focal point is about correct you can nail it and have a massive field of view to get your stars with! I use a Meade DSI and there hasnt been one time that a guide star hasn't presented itself!
As for your Lum channel you have to really nail this one as it gives you the clarity, i use synthetic lum because i utilize a DSLR but ide guess that its virutally the same method. I push the data to a inch of its life and then a little bit more then when i blend it back though photoshop i can scale it back for the right balance, its proved to be very powerful at bring out clarity and brightness.
Keep up the good work though