2015 Subaru WRX MT Remote Start/Alarm Fail

These are the issues:
a. Car remote starts but dies after about 1-2 seconds of running. Shutdown diagnostics is 3 flashes "low or no rpm."
b. Remote doesn't lock/unlock doors, however, parking lights still flash 2x for unlock and 1x for lock. Also, there is no "chirp" or "honk" during unlock/lock.
c. During "pit stop" mode, there is an audible "click" from the remote start ECU and lights flash 1x, then there are 2 more faint "clicks," then a TPMS fault is thrown. It'll do this 3x in a row then stop. If I take the key out as your supposed to, the car shuts down will try to remote start itself, instead of staying on.
In addition to the remote start ECM (Python 5706), there are 2 bypass modules (idatalink ADS-ALCA). I assume one is the immobilizer and the other is the lock/unlock doors?
The WRX still starts normally with the OEM key and the lock/unlock/trunk still functions correctly as well. Any thoughts on what could be wrong? Or where/what should I be looking at first? I'm not new to troubleshooting mechanical issues, but electrical and especially remote start systems are difficult, to say the least.

Is this a new install, or old? Did you do the work, or someone else? Have you tried learning the tach?

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My ex once told me I have a perfect face for radio.

The guy who did my remote start/alarm install either was in a hurry or was too high to care about his work. The wiring looked like a bird's nest. Some butt connectors weren't even crimped and things that should've been soldered were quickly spliced with a little electrical tape. However, despite the ridiculous install, the remote start and alarm did function appropriately.

Now to the point. I decided to try and make the install look more organized. This required lengthening/shortening some wires and some new soldering. The process seemed pretty straightforward. If I take my time and work on one wire at a time everything should work as it did before......except it doesn't.

Yes, I did try learning the tach, however, nothing changed. I referenced wiring diagrams and various install instructions before, during and after this remote start debacle and I'm still at a lost. I'm going to draw out a schematic of how everything is connected and post it. Maybe somebody can tell me where I went wrong. I appreciate any and all assistance on this "reinstallation."