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I am thinking some of your ramps would be a challenge for the chickens to get up.
My rule of thumb in a perfect world:
Make your ramp twice as long as the drop which would give you a 6/12 pitch and an angle of 22.5º.
"A 4x4 block attached to the end of your ramp to make a step up will do a lot to reduce the slope also."
Then again if it works do not try to fix it.