Unfortunately IFS is not designed for flex. It is designed for comfort on the road. However low-profile bump stops may help. If you really wanted to you could do ball joint spacers, however i would not recommend this, they are not safe. Be aware as well trying to get more flex out of your IFS system, if you droop too much you will tear CV boots. You may want to look into some IFS lift kits. More clearance= more room to flex. Really Straight Axle Swap is the way to go if your wheeling often. If your fond of IFS and against SAS you can look into some long arm kits possibly.
hope this helps
