Back to the beginning.
All 1708 can be used with epoxy, it just wastes some money and adds some weight by sucking up more epoxy, although using it mat side up on the last layer does help to create a smoother surface. Other than that there is no need for the CSM stitched to it when using epoxy.
Don't call it cloth, cloth is a totally different product, it's not mat either. Normally products like this are called biax or fabric, fabric being a very generic term that includes many types of fibers, knits, weaves, etc. Cloth is a rather fine woven product, made in weights up to around 10oz's, at 18oz's a very similar product is called roving
1708 without the CSM (the 08 part) is just 1700, but depending the manufacturer could be labeled a little different. It comes in many different weights 17 oz is just a common one, I have a roll of 60 oz, and you can get it at over 100 oz weights.
In your application 1700 would be your best bet if you can get it, but other weights will work.
I only wanted to get the terms used back in line so when other people read this looking for advise everyone knows what products are being discussed, it can be tough enough to learn about a whole new world of products, and even tougher when the terms used to identify products get a little mixed up.
