Good questions!
I used Hallertau and Saaz for battering because I love both of their bittering properties, so I figured that I would combine them. I also use both for early favoring, so that keeps it consistent, for whatever that's worth. You could use one or the other for bittering and get good results too.
I scrape off the hot break whenever I brew pale lagers and German ales (unless I FWH). This leaves less break material to be removed in the kettle from whirlpool, and improves clarity. I know professional brewers who do this as well. In fact, it was a professional brewer who gave me the idea. Don't worry if you skip this part; you can still get a clear product if you use Irish moss and get good coagulation and a good whirlpool.
Great! Looking forward to your feedback when it's done!
TB