Spike power problems

[3DWolf]

Getting dangerously close to ship!
We have 3 different parts of our robot that require motor power
Drive - Manip Loader - Manip Spitter
We're powering the loader through a spike because we don't need variable speed on it, and the drive and spitter are through victors.
The drive has one CIM on each side, the loader uses 2 CIMs with a toughbox, and the spitter uses 2 banebot motors.
The problem we're running into is when the loader hits a ball, there is a voltage drop and its popping the breaker in the spike - the breaker in the power distribution block is fine, but we got tired of blowing fuses and put auto resetting breakers in the spikes.
At first we found that the spikes were on the 40 amp section, so we moved them to the 20, then found that we had different wire gauges, and fixed that problem, but we're still popping the breakers.
We're kinda stumped - anyone have any thoughts