you currently using Flux in-ears right? the bass not tight enough?

There aren't a lot of IEMs that would cost around the price of the SS Flux In-ears and have the same amount of bass extension. I do agree, it isn't tight enough and can be a little too boomy.
If you don't require an in-line mic, you might want to take a look at the Shure SE215. It's presented with better presentation at the mids and also being brighter on the treble. Bass is more controlled and more refined.

In any case the SE215 may not be your cup of tea as it is still considered a bass-heavy IEM, but not over in quantity which would qualify it for bassheads. It's just a little bit more controlled than the Flux and doesn't extend as deep, but you still might not find it tight enough for your liking if you want something even tighter.

Hard to recommend something if you don't specify a budget.