Finding realationship manager for lower mortgage rates

[Roy Mitle]

This is for buying a home to live in (rather than a rental). We need to take on a jumbo loan 

Obviously want the lowest rate. It seems lowest rate is with contacting banks directly, parking money at them and getting a "relationship" discount. The challenge is how to find a bank with the best discount. Previously I didn't have to worry about it - rates were low, just ask a mortgage broker and they got you a good rate. Now with rates high it could make a big difference. I don't want to call every bank but these discounts are hidden so any ideas?