I DONT HAVE THIS PROBLEM. I PLAY EVERYTHING WELL.
Of course you do.

Sticky Launcher. I don't know how, but I've come to terms with my handicap.
I had the opposite problem. When I first started playing demo, I ONLY used the sticky launcher. I couldn't hit the broadside of a barn with pipes. Years later I'm still really inconsistent.
I used to not have very good pipe aim til I played demoknight exclusively for awhile. When you can't lean on stickies you got to rely on pipe a lot unless going full blown sword only demoknight. Tr_walkway also helped a ton with my pipe aiming as well. Now my reaction time for pipe aim is pretty good until they get into my close range. Then I start panic spamming since demo's aren't so great with the close range stuff. I always try to aim a little to the left or right of the target depending on how they are moving, unless it's a tunnel where they can't move as much in which case its good to aim slightly over the head so it will land about at their center mass depending on how far away they are.
A bit flabbergasted though at someone not being good with stickies, though I can breath sticky spam so my thought process may be bias. Even if you aren't good at predictive aiming with stickies or whatever the problem might be, there's always finding some choke to camp which tends to be a pretty effective strategy for newer demo's trying to learn how to work without hitscans.
Til most move on to the rapid fire m1+m2 spam when they get used to them. Ah, goodtimes.