Hey there! The first thing i would suggest is to check whether your seat is level or is tilted forward. Since you are sliding down, it seems that your seat needs adjustment to be level. I know how frustrating it is to not be comfortable on the saddle, I am riding only second summer and already bought 2 saddles. Luckily, the last one seems to work the best ( Selle Smp). Regarding pain in your back: i would suggest some ab exercises, but not just regular crunches, try doing some yoga ab exercises and pilates. Also, every time you are on your bike try to sort of imagine that your want to touch the top tube with your belly and that will put your pelvis in a better position. I am also a newbie, and just started doing 40 miles on a bike and i must say that after my 4th ride my body feels much better than after first. So, some muscles just needs conditioning. Good luck



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