Watch the C# Phrygian 2 online guitar lesson by Robbie Calvo from 50 Modal Licks You MUST Know
I think you are going to dig this one! It's a little tricky from a technical standpoint, especially if you struggle with bending notes and intervallic approaches. The video dialogue explains how to approach the licks technicalities. One thing to watch on this phrase is the timing. You'll want to make sure it doesn't sound rushed, it has a laid back soulful and bluesy feel to it, so let it breathe!
The double stops are all diatonic major and minor 6ths from the key of A Major. Try experimenting with this double stop line you could reverse the order in which I played them and I think you'll find it still works providing you phrase it the same.
Pull up the backing track and try joining licks 18 and 19 for a longer phrase. Reverse the order and see which line works the best for a seamless solo section.