dont index tier 2 and 3 at all, thats money for nothing. the only links that need to be in the index are the tier 1 ones and the way i get those in is the tier 2 itself. 30 or 40 gsa links at a tier 1 page and its crawled in a day or two, same every time. what usually stalls it is dead targets, half a scraped list is gone by the time you run it so the links never exist to get crawled. a list somebody verified this month fixes that more than any indexer did for me. still use one on the few tier 1 links that stay stubborn but thats maybe 5 percent