" You got to adjust the WDH AFTER you raise the rear."
Terryallan.. Now you get it!! Yes, this answers the OPs question. I think what confused you, was when I used the word returning, meaning from original WDH setting, PRIOR to adding the new springs. With the new springs added, the front will not be unloaded quite as much, when returning same hitch weight, thus the reason for readjustment of WDH.
I do think the OP understands, as was his reason for asking the question. John and myself said an adjustment would likely be necessary, after adding the helper springs, as you now understand by your last sentence I quoted. Lets not confuse the issue!
Jerry