I recently just bought an areator from home depot.. it is one i pull behind the 4 wheeler and it pulls plugs.. I areated this week.. I only went over the areas 1 time with it.. WHen looking at the lawn it definatly pulled plugs but i am thinking i may have been able to do it more.. Would it be ok to do it again in a month? or should i wait till next fall.. This is a new house since last sept. The ground in very hard in some places now. So should i do it again or would that be overkill?