I have had hip problems in the past, not necessarily running related. I often found they were helped by fast running-sprints are the best thing(with walking in between), never run slow. If you have pain in the middle of the side of the leg-between knee and hip it is an itb problem. Not just pain but if you hit the side of the leg is there discomfort?
I have just bought a pr of shoes, inov-8 195's and they are out of this world. I went to Ellis brigham mountain shop at covent garden and was told that I had neutral feet which was news to me as I pronate in motion control shoes. Answer, it is the shoes. If anyone goes to Ellis Brigham ask for Des, he is fantastic. Despite the fact that he didn't have a pair in my size, he spent the time with me to find out my size and whether I was neutral.And then point me to another shop.
I also cannot run much off road due to my ankle/foot being very weak. But i could in these shoes. Try running on your toes more or at least midfoot. You could try race shoes or inov-8 shoes and you will do that.
If you get calf discomfort and nothing else(no hams or hip discomfort) you are doing it right.Inov 8 shoes are close to the ground, mine are only 3mm more at the heel than the toe. Out of this world!I have a very narrow foot and i can use them with thicker socks than normal, but Inov 8 say you can put a thicker insole in to take care of this.But for me, you need a reasonably narrow foot. Mine's on order!