The bumpstop is for the rear. If you do not have bigger tires than 275/70/18 you should not have to use the bumpstops. The shock and coils are within spec for stock "bumpstops" At least the nitrocharger shocks. The sport I´m not 100 percent sure of but you just have to compare the new shoch with the stock and see if the new sport shocks are the same lenght colapsed as the stock.
If you do use the trackbar relocation bracket you MUST use the bumpstop, otherwise the relocation bracket will hit the shocks.
If you have choosed the correct coil rating for you specific weight of you jeep ( depends on your aftermarket mods such as rear bumper in metal for example ) you will only gain about 2 inch and then the track bar relocation bracket is of no use at all.
The rear swaybar should be used, especiaslly on road but also off road. There is no reason at all to take off the rear swaybar. You will not gain any more flex becuase you take of the rear swaybar but you will lose stability,