http://www.military.com/benefits/military-pay/special-pay/comparing-crsc-and-crdp.html
Here's a link explaining the two...hope it helps! Sorry your PEBLO sucks!!
Not sure how CRSC works but CRDP is for service member that are retirement eligible with 20 years of service and at least 50% disability. With CRDP you get your full military retirement pay + VA disablilty pay!