Sarah
I too am a bit like Riri so have different basal rates going for different hours of the day and have also got the Combo. Basal rate testing is never an easy thing to do especially when it involves broken sleep and getting up the next day to get to work etc.
If you can though, try to do some basal rate testing tonight even though its Friday and you might want to go out. If you can, eat a small amount of carb at about 4pm and do a bolus but don't eat another meal with a bolus. Start basal rate testing about 10pm every hour onwards until 3am in the morning but don't drink any cups of tea or coffee with milk in them after 11pm or when you would normally go to bed as the milk can make bg levels change. If you feel that you need to eat something after 6pm just eat a salad (l ettuce, etc, lemon juice as dressing) and some sugarfree jelly to keep you going.
I don't use any software on computer to log my bg levels. Instead I just use the Accuchek Pump bg diary as that has everything I need to sort myself out and has columns for everything including hourly basal rates, bg levels, carb, correction dose and TBR.
When changing my basal rates, I look at my bg levels and then make changes to the existing basal rate programme that I am using but before I do that, I write down all my existing basal rates first and then change so that I can see by bg testing the next day what effect the basal rate change has been. I note that you are changing some of your basal rates by 0.05u. That's quite a steep change so can see why you are swinging a bit. Don't be worried that you may end up getting a different basal rate for nearly every hour. Mine are somewhere near to 0.50u per hour that I was started off with by dsn but over time my midnight basal rate drops to 0.30u until 2am, then its 0.43 and slowly rises upwards from then on and then drops a lot mid afternoon from 0.53 to 0.18 at 3pm then rises again at 4pm and so on, rising to 0.90 during the evening and then dropping again from 11pm onwards..... So don't worry about making the changes. The Combo by default will use the target level between 4mmol to 8mmol so is meant to level people to 6mmol so make sure when you do your basal rate testing that the targets are set to be the same as the target you are using to get your bg levels ok every hour when you do your basal rate testing.....
Rome wasn't built in a day and all that. You'll get there in the end.....