If you can afford it then get the extreme 25. Stick an extreme medium mixed brush on it and you will be amazed at how different it is. You will definitely speed up your normal cleans and be able to reach any awkward windows fairly easily. It's a big expense but the speed alone should help pay for it. And your arms and shoulders will feel much better. I also had an slx 22 and to be honest the slx 25 is better. That 3 feet does make a difference.
As for technique, with an extreme 25 you'll decide whether you want to clean side on or front on. Personally, if I can, I will clean front on over a connie as I don't like twisting my body and shoulders if I can help it.