First up, Jim's comments are very much spot-on. Let's try and find some fixes...
Sound sources...there's an easy fix here, one that gets you more space while avoiding a functionality trainwreck, and that's removing the drum modules altogether. In the words of Rocky J. Squirrel, "That trick NEVER works!". The reason is that you're really MUCH better off using a dedicated drum machine...plus, if you have one with trigger outputs, you can always use that to fire some modular modules to add THOSE sounds alongside the drum machine's. The crux of the problem comes down to two points: expense and space. For one thing, building something akin to a TR-909 in modular can easily start to veer off into the general price range of an ACTUAL, ORIGINAL 909. And it would be large, more than likely taking up much of an entire Mantis cab in of itself, crowding out other modules.
Clock modifiers...OK, you first need a head-first dive into Ladik's listings. Right now, I'd peg them as the BEST overall source for stuff to mess with timing and/or logic. Plus, they're CHEAP...and offer hard-to-find things like their Derivator, stochastic Clock Skipper, and so on. Anything that you can add to tamper with the even, metronomic flow of time works here...to Jim's list above, I'd also add trig/gate delays, electronic switches, stochastic sequencers (Euclidean, etc), chaotic modules (Turing Machine, etc) that output trig/gates, and on and on.
As for the Tirana sequencers...don't use them for pitch OR modulation. Instead, they're very useful, along with a chromatic quantizer and an adder, for automating transpositions of CVs. Tempo changes, key/mode changes, and the like...that's the very best use for them, sort of like the "shorter" Serge Sequential Programmers.
Lastly, what does "crazy FX" mean to you? Weird time-warpy things? Hideous audio mangling? Something else? The Deflector Shield is definitely "odd", to be sure, but frequency shifting's been part of modular for a while...hell, it was part of the later iterations of the pre-modular Mixtur-Trautonium! Plus, some things become "crazy" when you put them together, but not necessarily on their own. Case in point: working with signal inserts. The Doepfer A-106-1, a variant of the MS-20's Sallen-Key filter pair, has one of these...so you could put a delay in there and have increasingly-filtered delay returns. BUT WAIT...so, you could THEN add an Alright Devices Chronoblob2. It's a delay, sure...but in its "original" mode, you have...yep...YET ANOTHER INSERT, this time in the feedback path, so that every repeat in THIS can be altered as well by yet another module. So...how about some spring reverb? Add an Intellijel Springray II...and OH HELL THERE'S ANOTHER INSERT!!!
...and on and on and on. So it's NOT simply a case of finding the right module, per se...combinations of specific modules that might SEEM to be fairly "vanilla" on first glance can actually turn out to be utterly bonkers when patched the "right" way.