the sub frequencies (lower frequencies) in the bass do not stand out very much. Distortion may cause the 808 being mid heavy. either mess with the waveforms or edit distortion effects on the 808
I think the bass note at
1:14
is a great choice, very suspensful. I actuall think you should hold it at that note for longer before gliding down the other note (the root note)
I think the string synth could some work, the way you use it here would sound a lot better if it were more like a stab, instead the envelope has a long attack. Just a thought
also there is way too much in the bass around the 2nd octave just take a look that. that's where the kick should be. you don't see the kick there do you? you're drowning it out.