GT-P3100 ROM okay on GT-P3113
I'll plan to post this again when I've met my ten post threshold, but for anyone interested, I just installed v6 of psndna88's modified stock 3110 ROM on my 3113 Tab 2. It works!
The only two "problems" are that: 1) IR blaster doesn't work. 2) You will have to stay in Airline mode so that the "no (cell) service" sniffer doesn't run your battery down. (You can still enable Wi-Fi and BT even in Airline mode, so not a problem.)
I went through the system apps and removed or froze junk using Root_App_Delete and Disable Service Apps.
This gives a very smooth and fast Tab!