Would I get better signal quality by changing my LNBF from the standard Sadoun linear .4db lnbf to an Invacom .3dbLNBF? After tweeking the adjustment on my present system I'm getting around 70% signal.
Although the advertising suggests that the Invacom is higher quality, I really doubt that you'd see much difference. Both of those lnbfs are consumer grade lnbfs, that have worse specs than the lowest grade of Norsat lnbs (not lnbfs). In general, you're much better off spending money on a bigger dish than on a better lnbf anyway.