I've been playing guitar for some time, and often when i do improvisation exercises, I hit notes which sound too tense to finish a run/lick/riff on. Kind of like having a sentence which no full stop.
The note is not out of key but its either tense, or not complimentary to the backing chords... I then often lose my timing because I have to quickly find another note that sounds right to finish a given riff on, or start again.
So my question is, what is the best method (other than using your ears) to work out which notes safely resolve and which notes will not given any key you are in so that i can then visually in my mind see where i can start/end licks and sound more melodic to the backing tracks.
I want to be able to understand which will and will not work solely from looking at keys/chords on paper. It would help me see in advance where i want to take my improvisations.