Hi, congrats on the new excal! I have a straight shaft, I don't know what is the "best" one to get, I got a name brand straight shaft but didn't care for it, so I have a custom made one myself. The hip mount seems good but the drawback to it is that unless you take extra care, the cables can get pulled and damaged. Chest mount seems to be a good idea but I haven't used it in that configuration so I can't comment on that one. It would definetly get the weight off the shaft. Best advice, see if you can get your hands on some set up the different ways and see for yourself, if you can't do that, I would check the price of chest mount vs straight shaft and try the cheaper of the 2 first and if you didn't like that then try the other. Good luck and really using it as it comes from the factory isn't all that bad, I used mine that way for 2 years and you will get built up for it and when the gold and silver start filling your pouch you won't even notice the ergonomics!