What you have to remember is how your monitors, room and your ears affect things, too - the louder the overall volume is, the easier it is to hear to low and high frequencies that may have drop-offs in both your monitors AND your ears.
Same can be said of computer/software courses. I took IBM Assembler Language and Fortran courses at McGill in 76/77. Then Pascal at Boston University, taught myself rudimentary Basic and DOS after university. Then 'mini computers' came along - BU had ONE 'mini computer' when I graduated, only...
Possibly switching to a dynamic mic, like a Shure SM58 might help? With a pop screen, of course. They can be bad with splosives, of course, due to the proximity effect, so back off the pop screen a couple of inches from the mic.
It sounds like you have a monitoring problem. What monitor speakers are you using? What's your mixing room like - size? Acoustic treatment?
We can't tell you what your kick and bass levels should be - every mix is different!
A good mic picking up the acoustic guitar's real sound is going to top a piezo pickup - any day - unless you want that honky piezo sound. I've tried blending the pickup sound in (with Taylor pickups) and never liked it.
I use one at 12th fret angled towards sound hole and one at lower bout method. I've got a cheap set of SDCs, and A/B-ed them with two LDCs and found little to no difference, except my LDCs are better and have more defined high end, so that's what I use now. And I only use 2 mics when the...
As to your bass problem (different volumes from each string) - this could be the way you are playing, or a pickup adjustment needed. As long as each note is separate, you can automate the volume on the track, applying a little compression will help, but not fix that.
I had a Gen 1 Mackie ProFX mixer, only used it a little for recording (mostly to a Boss stand-alone digital recorder). Like most of the mixers 10+ years ago, the A-D converters were not-so-good, and turning the volume up for better signal introduced a whiny high pitched background noise. At...
Live use or just recording? I ask because for live use, its netter to have separate volume and tone pots for each pickup, so when you switch pickups mid-song (like for a lead part) you don't have to also adjust controls. So #1 for live, #2 for looks!
I built my own 4" thick traps, and have one corner wiht a door next to it, so I just pput the traps flat against the corner wall - which is better than nothing. As you have a little room to work with (9"), you use the 4" trap at a slight angle, and stuff the area behind it with more rockwool.
Are these bluetooth wireless headphones or is there a transmitter that plugs into your computer? If the latter you can just plug it into the headphone output of the interface.
If they are bluetooth, note that there is latency in them.
If you are going to an open mic that actually provides a real monitor mix, kudos to them. At my open mic, what comes out of the monitor is the same as the mains, but as the room is not overly large, the powered speakers on either side can be heard easily by all but sitting (chair) performers...