For me, soloing is extremely easy, I can throw in a 30 minute improvisation at any given moment but I cant come up with an original chord progression. IMO, When your coming up with a solo don't really put too much time into it. If you have anything to record i would suggest recording your attempts at making them and playing them back to see how they would fit. Don't be so crucial on how they sound either, other people aren't gonna notice a very small detail.