My brother Dan and I built lowered mini trucks years. The dropped spindle will be plenty in my opinion as it sounds you are not looking to be "slammed"

Don't forget a two inch dropped spring with a 3 inch dropped spindle gives you 5 inches of effective drop (or close to it) You could go with a 3 inch spindle and a 1 inch spring for a 4 inch drop.

Might be a hair too much of a drop for your application from what you have described.

Don Jr.