I was able to get it back to the original version 1.11.1 as well finally, I had to make sure to go back into app admin and block all updates again. During the short time that I had 1.11.3 installed, I was able to get one of the new cars, Ramsey's Rocket Bunny Subaru BRZ and it remained in my garage when I reverted back to the original version 1.11.1, but I was only able to get that because I paid for the car. It is also letting me win stage 6 BRZ upgrades now back on 1.11.1 which weren't there before.
BUT... If I try to use any new version of the game (or any older version for that matter), all my gold and money remain at 0 at all times, even if I completely uninstall the cheat. Basically it looks like I'm stuck using version 1.11.1 for good, or until a new cheat comes out for the new version. Even when I undo my jailbreak back to stock iOS the game still remains at 0 for gold and money no matter if I win a race or win prize money/gold, so there is no way to win any of the 2 new Liberty Walk Audi cars using jailbreak iOS, nor the stock iOS (old or new versions of the game). Not sure if there is a known method of getting all the hacked data off the phone if I decide to put the phone back to stock iOS, but if there is, I would love to know how.