You desperately want to dance wonderfully but your partner/s know just five or six standard moves, boring you to death.
Only a few months ago, one of my instructors told me the most useful single thing I can remember in any class :-
'When your dancing, remember it is you, the leader, who worries more about being bored than the follower. DO NOT let this stress you into trying overcomplicated routines that you don't know well. You may have done the same routines, 15 times over, and be worried that it's getting a bit repetative - your follower has danced with 15 different partners in that time, all of whom use different routines. You are the one getting bored, not her'
In my opinion, if your partner only knows 5-6 moves, do those 5-6 moves WELL, repeatedly, until such time as you have built up enough trust and rapport to add another move into the mix. Even then I try to make a variation of one they already know - they know CBL, then add CBL with a clockwise turn, then CBL with a travelling turn etc.
Do you break away and do some freestyling and shines? Or is that really mean? It leaves the other person, who isn't that great at dancing, feeling rather silly and just doing some basic!
I like my shines. I enjoy getting out there and wiggling or using fancy footwork, and getting the approving look from your follower when you've done a smooth routine, or a good move. In my experience, many people who have danced in nightclubs will be happy with shines, putting their normal dancefloor wiggles into a mambo. As long as your both still on time, it'll look good.
However many other times, when breaking away to do shines it's become immediately apparent that it's freaked out my follower, or they have simply stepped into basic not knowing what else to do. For me, if they've done three-four bars of mambo, without extra style, I'll guess they're not comfortable with it, and take them back into partner mode.
You can often tell by the expression on their face as well - panicky, 'rabbit-in-the-headlights' facial expressions are a good sign your partner doesn't like shines
On the other hand... when the hell else do you do your stuff?
If you're not enjoying dancing with this partner, and feeling bored, there's only one answer to this - with another partner.
Ask yourself why you are dancing - 1) so you can feel and look good, 2) so your follower can feel and look good, or 3) so you both can feel and look good.
Ideally the latter. Failing that, personally, option two has priority over option one.
Just my thoughts...