I'm not a doctor, but it sounds like your core muscle group is a little weak. Like any physical activity, strength and dexterity will always help.
I used to always suffer from lower back pain/spasms, but once I started to exercise my core it greatly diminished my problems. It doesn't take much and don't over exert yourself believing more is better. You may actually exacerbate the problem through strenuous exercise. Gotta learn how to walk before you can run.
Some basic core exercises everyday should do until you become stronger. Know you limits. You won't see results overnight. It's a slow process.
Instructions on simple and easy core exercise routines are abundant on the Internet, but if you still feel pain and no improvement, then please consult with your physician!
I can't imagine the next release of irons are going to be revolutionary enough to wait over a year to get. Only reason I may wait is hoping the 716's come down in price, but I am not sure they will come down enough that's worth the wait. Same applies to the 915 driver. Not sure the 917 is going to be that much better to spend an extra $150+ to get instead of the 915D2.