I usually use the Harmonic Minor exclusivly for high speed alternate picking and harmonizing bridges between two main rhythms. The pentatonic usually at the 4th beat of a bar because it really gives that punch and pause. Ending with a harmonic note will make it sound awesome. Try also to make a small chorded rythm if you stuck and dont know what to play. Its really makes things sound fresh. And another thing this is if your stuck, you should do long progressive taps that will make you think what to play next. The same thing goes for alternate picking. Just pick on 2 strings, but for an entire bar. Trying what to play next is the hardest thing. If you can think fast a variety of scales, rhythms to play, then go ahead and record!