You have an issue...you don't feel like you're getting enough physical "feel" from your bass on stage.
There are a number of potential solutions to that problem, some I'm aware of, some I'm not, but I'm sure running a bass cabinet face down on the stage is not the solution to this or any issue. It would likely end up creating other issues, not the least of which would be probably damaging the driver(s).
This is subjective, but my own experience and perception (which I'm not saying is or should be yours) has been that with a number of well-fitting IEMs, I've gotten the convincing (for me) illusion that there's an amp behind me when there's not. With subs (some variation due to the stage and gig type), I generally can't tell whether there's an amp or not...if there is one, I've not been able to tell whether it's on or off. Even in rehearsal rooms without subs (and so no expectation of that feel), I've gotten that same effect with some IEMs, some less so.
Yes, there are pads and other potential solutions, but I'd first ask what kind of IEMs are you using? And then what's the monitor mixer setup (i.e., does your band have an IEM rig)? Also, what kind of gigs are these (venue/stage type, how loud and as @WayneP asked, are subs typically involved?).
You're the only one who can hear and feel what you're hearing and feeling and obviously, you can't hear what anyone else hears, which is one thing that's obvious but often not out front when considering this and can create real challenges in this area. It also creates the possibility that you can believe that your IEMs are performing optimally when they simply aren't. The best you've ever heard can actually be falling short of what's possible in terms of providing bass and sub bass, and a marginal difference there could be the amount that's necessary to create that illusion that an amp is there when it's not.
It may end up being the case that there are no IEMs that can give you what you want, just saying if it were me, I'd check as a first course.
