Kimberly,
I don’t feel there’s a big difference between IC in RUT or SPX. I do like SPX more because they list more weekly options. As far as breaking up put spreads and call spreads, I like to put on Iron Condors as one trade even though getting a fill will require sitting on an order for a while. If I don’t get a fill fairly quick, I will offer the same trade but keep an eye on the price of each spread. If I’m trying to fill a 1.80 credit, I don’t want to get 1.40 for one side and .40c for the other. If that happens and mid prices shows 1.40 for one side and .40c for the other, I will move the strikes to where mid prices are close to .90c for each spread. So leaving orders GTC is a bad idea because I want the premium to be balanced between bull puts and bear calls.