Hey, bass sounds pretty good going straight into the board in my opinion. Almost upright-ish, really fits the track well!
Setting up the approach tone for walking and "getting lost in the details" - I don't want to mislead you with bad advice or anything and I know that there are people who can walk much better than I can, but I think this is totally normal. In fact, it's my opinion (take with a grain of salt) that this doesn't actually go away if you're playing at your limit - whether that limit is quarter notes at 55 bpm or eighth notes at 150 bpm.
From what I'm hearing, you're definitely on the right track; you sound good to me and given the way you practice, you'll get comfortable walking and improvising at this tempo and you'll be ready to push your limits. (Not that faster is necessary. Not everyone has to be Charles Mingus or Stanley Clarke. But it's definitely a good thing for practicing.)
Inspired by your progress!