Diff drop kit

Team,

I lifted my runner 3 inch with the RC kit....they gave me only the 1/2 spacers for the diff drop and the bolts were same size as the originals.

Once installed, the bolt only tightened flush with the washer or almost flush....doesn't protrude at all
Should I be concerned?

It was actually a diff drop kit for a Tacoma, but the RC rep told me they work for this 3 inch lift.

Seems to have taken pressure off the cv joints, so I'm a believer....

Thanks for any help.