This is a mod that should allow your rockets to work in KSRSS reborn without needing to build a larger rocket. The patch contains modified code from "Jimbodiah's Simple RSS Patch". This worked well when I played normal RSS, but I noticed there was no mod like this for KSRSS, so I edited the values to work at the 2.5x scale of KSRSS.

INSTALLATION
Put the contents of the "GameData" folder into the GameData folder of your KSP install. Simple as that.