are you running extended stock-replacement bumpstops like terraflex or something

If you extend the plates to protect the zerk, just roughly measure from the highest point of the uca nearest the zerk to the extension plates you put on and subtract roughly that much from your bump stops

also if you torqued the UCA's while it was still in the air, back the bolts off and retorque them with it on the ground, itll both get the preload off the bushings and make sure your uca bolts are torqued properly

Was trying to help ya but.............
Stock bumpstops there is one problem
need extended
also your stock front shocks if you have over 35-40,000 miles are done, they are weak combine that with ANY read again ANY lift and they will not hold up like they should because they are WEAK and WORN out.
With again ANY type of lift you have to have a combination of good parts to work correctly
So weak shocks one problem
stock bumpstops another
and to not upset you further I will stop there
geez try and help someone

ahh yeah, i've seen those guards.. they'll serve as extended bumpstops when used with the stock bumpstops

rub some chalk or something on the bumpstops and as gently as possible try to get it to make the noise

it sounds like from your description that you're feeling it jar as it hits, so im sorta assuming it's not more a noise that's bugging ya eg. swaybar etc

i personally add bumpstop for the amount of lift I add UNLESS i design the shock / coil spacing around it which is basically impossible to do with the KJ fronts due to being forced to use stock length shocks, to keep the coils from stacking / rapidly degrading it needs bumpstops and that ignores addition of top spacers / clevis etc

if you can work the front suspension using a jack, you may be getting UCA-COIL contact

you've had it aligned yeah?

i dunno who put their swaybar links on upside down / backwards