I believe that if you play a lot the gloves last about a week and if its hot and you like to hit range before you play they won't last that long. I wish that they would last longer but if it changed the feel of the Sciflex I would decline changing it... I love the way it feels but do wish it would last longer.
I have not found this to be the case. I wear FJ gloves primarily, Titleist gloves when the shop doesn't have FJ StaSofs, and occasionally, a glove from the mail order company that Hale Irwin formerly endorsed. I rotate my gloves frequently and during warm (hot, humid) weather change gloves at least every three holes, and recently, every hole. That means I wear two to three gloves per round. Those gloves last well past the five rounds that 19hole says is the standard of measurement, but I find they still provide me the grip I require. I do go through a lot of gloves a year, playing as much as I do and in the hot, humid conditions normal to Houston. I have never experienced the problem that you illustrate, however. As the others say, get the right size glove--that will help tremendously. And I would recommend you get a professional to check your grip; that will address the two heavy wear points.