I know everyone has an opinion on what to do to shorten wires. I''ve been a vehicle mechanic for over 14 years now. I would not do anything that would put the wires at angles. Doing that would break the wires inside the insulation.
I've seen folks wrap their wires around a screw driver making the wire look like a coil. That takes up most of the length and looks ok. I've also seen folks use plastic wire loom to conceal thier wiring. The method I saw and liked was using steel or plastic baided loom. Looks awesome. Whatever you decide to do, try to keep the wires away from moving parts (servo arms, gears and linakges).
As for the solder VS crimp. I do both. I wick some solder into the wires, put the wire in the connector and heat it up to melt some of the solder out of the wire. I then put a good crimp on the connector. I've never had a wire pull out or a faulty crimp.
I hope this helps some

Ted