chf8845The DVR's listed on my account are Scientific Atlanta - GSH4642 and Scientific Atlanta - GSH8642. The main one is the one that I'm having problems with, but I'm not sure what one that is since I'm not home to look. EPG I'm not sure how to find that.
The 4642 is a regular receiver, not a DVR. The 8642 is a DVR. It came with either Passport or TRIO for a while. Easiest way to tell is the aspect ratio of the guide. TRIO is a full 16:9. Passport is only 4:3. Google for Passport or TRIO to see what each guide looks like.
Chances are that your varied tuning times is the result of SDV. Different receivers request SDV channels faster than others. Then again, my 8642 takes about 5-10 seconds to tune my local CBS HD affiliate, which I doubt is SDV, the first time I try to tune to it each day. Go figure...