it seems counter intuitive, but solder joints are a bad thing if you can avoid them. crimps are much more flexible and wont crack. theres a reason airplanes are full of crimp connectors, not solder joints on wires.
Preaching to the choir. Just bought a AMP 59250 and have a bid on a 59239-4. 
I switched to amazon bought splitters but I’ll probably rebuild using the cute little splitter pcbs from hansenhobby (back to solder but mechanically supported).
Look what I just found
damn. that look nasty man.