DB-25 Soldering vs Crimping?

[TheWildTomcat]

I'm building a project studio using isolation tape, drywall and Green Glue. I have a 16-channel snake cable I'd like to run in the wall between my main room and my iso room so the iso room could be used as a control room if need be. Each room would have two female DB-25 connectors wired to the Tascam standard. The snake has an extra channel so I could wire the missing pin (pin 13) and have a complete point-to-point bus.

I've soldered 14 out of the 50 connections and - what a mess! I see cold (looking) joints, near short circuits (although adjacent pins are so far testing isolated) and massive burning/melting of insulation.

Then I see these crimping solutions. My recording instructor (and mentor on this project) worries about oxidation of crimped connections and the pins getting pushed out of the housing on insertion. There is also a slightly more expensive set screw solution from l-com.com (item.aspx?id=10856, but I'm too much a newbie here to be allowed to post the url ).

So what's the consensus on soldering vs crimping (vs set screw) for DB-25's? This has to be done right before the drywall goes up. Thank you much!