speed 38400 baud; line = 0;
ignbrk -brkint -icrnl ixoff -imaxbel

Looking better.

However, after having the pty slave be recognized properly, the data transfer between the radios is behaving strangely.

I'm going to have to go through and debug what is actually happening.

I have a feeling the iflags and oflags of the tty aren't set correctly. I'm going to have to read up on what they each do to try and get data sent back and forth correctly again.