I used a tachometer to measure rpm. A little risky yea lol. I looked at the battery voltage and at about 50% throttle it fropped 300mV max…
Could it still be the battery?
Stop faffing about on the bench and attempt a short hover in stabilize mode. Bench tests are largely inconsequential and meaningless.
I did. Its not producing enough thrust.
Provide the .bin log from that attempt.
0.3 V is normal, under 1 V is OK. In what mode did you try to fly? Stabilized?
34 12-31-1979 7-00-00 PM.bin (580 KB)
Here it is. Lmk what you find 
Yup I was flying in stabilized mode.
No ESC telemetry, no battery monitoring, nearly all parameters at default. Not much to see, but likely plenty of configuration left to do. What process have you followed to configure?
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I just did the motor configuration to make sure that the right motors were in the right place according to my FC’s orientation, as well as initial flight parameters using the initial parameter setup in mission planner. From what I read since I was using a DSHOT ESC I didn’t need to do any ESC calibration.
Went down this list:
https://ardupilot.org/copter/docs/configuring-hardware.html
Then got to tuning:
https://ardupilot.org/copter/docs/flying-arducopter.html#flying-arducopter
Then got to tuning process instructions step 3.
https://ardupilot.org/copter/docs/tuning-process-instructions.html
I have only done stabilize since it’s the first flight.
Could the problem possibly be that I’m using a joystick/gamepad?
Do I need the ESC telemetry pin?
That’s a log of Motor Test. Post a link to one when you attempted take-off after configuring the Battery Monitor. And set these back to default (0)
SERVO_BLH_MASK
SERVO_BLH_OTYPE
What firmware is the T-motor ESC using?
Put that aside and use a standard RC System until you have a properly configured and tuned craft that flies.
Ok will do. The esc is using am32.
Doesn’t have the battery monitor, ordered one today, but here’s the log from my test flight.
I understand that AM32 has the same Low RPM Power Protect setting as BLHeli_32 which must be disabled with lower kV motors. This is enabled by default with BLHeli_32, I don’t know if it is with AM32. So, you will need to connect to the configurator and check and disable it if it is.
And, you should connect the Telemetry pin on the ESC to a Serial port and configure for ESC telemetry but this has nothing to do with this issue just something you will want later.
Do you not have GPS?
I went ahead and connected the ESC telemetry pin. As for gps Im just trying to get stabilize to work before attaching it in fear of potentially damaging it.
Low RPM power protect was already disabled.
Come back when you have a battery monitor. The kit of components you have should fly.
I went ahead and disabled stuck rotor protection which I believe is the “low rpm protection” you were referring to, as well as setting the motor KV to 380.
I did it according to this forum post.
I know it should fly that’s why im so confused 
Configure the battery monitor, connect the GPS and set ARMING_CHECK to 1 (all).
And get an RC System.
Alright ill order and rc system today as well although i doubt itll change much… especially since looking at the rcin from the joystick its able to do the full range.
Ill lyk how it goes
Went ahead and tested it one more time today (I know you said to wait but erm I got the esc telem pin to get my batt voltage). it was able to lift off!! I went ahead and linked the video. Looking at the battery voltage you can see that it dropped by way more than 1V, dropping to as low as 19.88V. I am going to go ahead and order a new battery. The RPM of one of my motors is significantly less than the others.
All that I changed inbetween the previous flight test and now was configuring through the am32 configurator to disalbe the low stall, as well as configuring each channel to the right kv (its default was 2200kv so it makes sense why the current was so low for the right pwm pulse widths…) Also I didn’t turn off any of the blheli configs parameters in mission planner, I left otype and mask.
Heres the .bin
Heres the video
…
Disable those and get rid of the tether. Don’t argue about the tether this has been discussed on here many times.
If you don’t know how to fly a multirotor start with a smaller quad that can take some abuse.