I had a 31 hour cut off with 14 day abstinance. It was supposed to be O+12 but messed up when I thought I O'd. Thanking my lucky stars now!!! 
Shallow missonary position. DH pulled out a bit just as he O'd. Used lime douche before BD but not after and kept my hips propped for 20 minutes after DTD and then J&D. Did O+12 after all that but think it was probably the O-31 that did it for me.
Was doing a mix of the IG and French diet as I'm vegetarian and couldn't eat much on the IG diet.
With the boys I BD everyday of the month(apart for when I had AF) and looking back I had a very boy friendly diet. Also O'd with the boys not this time. Hope all this helps. 