Leave it like you had it. You have plenty of capacity in your front axle (3950 GAWR) and you were at 3420. You want to be back to original weight. More is fine as long as you won't be over the front GAWR after you add people in the truck.
If you did want to make a fine-adjustment, you add/subtract washers under the head-unit. Changing the L-bracket height is for large, coarse adjustments. This explains why you went from 3420 lbs in front all the way to 3180. You were hardly transferring any weight at all.
thebrakeman ('70), DW ('71), DD ('99), DD ('01), DD ('05)
2004 Surveyor SV261T (UltraLite Bunkhouse Hybrid)
2006 Mercury Mountaineer V8 AWD Premier
Equal-i-zer WDH (10k), Prodigy Brake Controller