So basically, the Haas effect is at a basic level how you can take any sound and make it sound steroized, or widened. so if you have 2 identical sounds panned left and right respectively. if you start to separate the timing of those 2 identically sounding hits, your brain will NOT be able to tell which one is being moved as long as it's below 30ms.... so your brain HEARS the difference in these identical sounds that are panned left and right at the same time but now it sounds in stereo.
This is essentially how a chorus effect works.... i think maybe even a flanger too, it's like a frequency moving too.. not sure.
Anyways there's a difference in being "stereo" and actually sounding like a stereo. stereo wave file is left and right sound info, but it may sound just like a mono sound if both left and right are identical... like your 808... BUT if you put a chorus on it it will slightly offset the left and right and make it sound WIDER, this is cool sounding, but can later on bite you on the ass. these 808s are in the sub and low end range and when you mess with the timing of these big waves you can have noise cancelations and really lose a lot of your OOMPH.
I use sterero a lot, but usually on just one element. i think i heard it on all of your drums on both of those tracks. i'd say keep your kick as mono, and definitely your 808. you could filter it hwere your low end part is mono, but your high end is in stereo but that's for another discussion.
I use the simple delay in ableton to get the haas effect (you can youtube it) and i'll sometimes put it on a snare or a hi hat or some added vocals to get them to stand out. use it sparingly and it will jump out. if you have headphones check the track below, i put it on the hi hats. you can hear how they sound nomral until you get the headphones on and can hear the spread, like they span from left to right and go wider...
You can also tell in this track. i have the kick and snare in the middle, and raekwon saying "yea" in mono slightly panned, but the sample is WIDE AS fukk partly due to the haas
what i'm trying to say, is that you need a good mix of haas, and non-haas and i was hearing everything in your track having it to some degree. it's cool sometimes, but it's just a good thing in general to know when you're using it a lot o npurpose ya dig? i hope this helped some