LMAO, no ASA was refering to my back ground in Karate and probably my education in Sport Medicine that I have often offered up to others, even if they did not want it!
First off, not every one will be able to do the splits, or get close. It has more to do with the connective tissues than the opposition or placement of bones in the joints. Yes the Hips are ball and socket joints and "Should" be able to move out for the splits, but we are all set up differen tnad we often see people that are just "tight".
First off you are stretching "WAY TO MUCH"! Stop it. Think of it this way, when you stretch you are ripping the muscles slightly when moving into possition. Next up you are spending so much time stretching that you are missing out on other training. I always say train smart not long. Notice I did not say anything about training hard!
Second, the stretching you are doing, NEEDS TO BE DONE AFTER YOU WARM UP! Do not ever stretch deep with out a warm up...Unless the idea of a pulled groin muslce or shredding a innner thigh tendon is a appealing idea..in which case you are on the wrong boards! Look up S&M not MMA!
Try a few different ideas from this OLD timer. Take as hot a bath as you can stand, in a pair of shorts with mats around the tub. Once you are as warm as you can get, jump (carefully) out and stretch deep. When you feel you are getting cooler, jump back in. This is not something I learned in school. A few of the dancers from the Royal Winnipeg Ballet used to do this and those guys were very flexible in Karate Class, but they still hit like girls
Do some balistic moves and use different equipment to get your stretching in, Leg racks are good but home made shuttles are good as well. Do not deep stretch more than three times a week, you will find the healing muscles are more pliable than those constantly attacked by stretching three times a day.
As for the back, Work flexiblility but also strength and get massage and physio, you will thank yourself later.