I highly recommend a proper bumpstop, as you know it keeps the shock mount intact for its intended purpose of just holding the shock. Also remember that the TT yj kit thrusts the axle forward and the stock bumstop will no longer be centered over the axle. Also the spoa configuration causes the stock bumpstop to just barely touch the outside 1/4 of the spring plate. This lands it directly on the rear half of the ubolt and nut and quickly gets chewed.
I angled my ford shock towers and lower mounts, along with extending and angling the stock bumpstops. I also welded 1-1/2" square tubing across the spring plate to keep the ubolts from touching the rubber bumpstop, and provide more lateral contact.
Mine look like this.