Good on you for having a crack at a DSO on a tripod. If you are looking to take the next step, keep an eye out for an EQ3 with tracking motors ( you only really need the RA motor drive. They can be found reasonably cheap and will take lens only images to another level.
I have one and live it. It's light, portable and reliable and yields great results
Edit - I have even used my swed 80 pro with decent results on one