WOW! 375 grains with your 70# bow and 31 inch draw length is just asking for it if the bow is maxed out at 70#.I was at 400 grain arrows and had to getthe spring tension internally advanced. My only hope withyour situationis that your arrow weight is heavier than375 grains. Either way you need to attach launcher arm cable to the lower side of your grip on down buss cable. Should be about 5-6 inches below rest/bow shelf. Try that first and read the post above this one for further rigging details. If you already cut the launcher arm cable you are going to need to get some more of that material at the local archery shop...I don't recal what it iscalled, (I'm sure gibblet will know name, size, diamter, etc).

Keep adjusting the launcher arm cable in very small increments and then test. There will be a spot where everything just comes together. Just like I said before, make sure your center shot and nock height is all dead on and then adjust your launcher arm cable tension. With your set-up you don't want to have launcher arm at anything less than 90 degrees at full draw. Draw your bow and have somebody else push launcher arm toward you, if it moves you are too loose and tension and the rest will not fall fast enough. On the other hand make sure your rest launcher arm is not going to 90 degrees and your still pulling string back another 1.5-2 inches. That will be too much tension on launcher arm cable which then will pull your down buss cable toward riser and cause all kinds of issues.

Let us all know what happens...we can all keep learning by each others experiences.