Looking for advice on soldering lead free paste to a board with very heavy gold plating. I have learned from the Customer that this is HARD GOLD and that it is 10-20 Micro Inches Hard Gold over 100 Micro inches of Nickel. When we reflowed the solder it looked like is stuck but we found out that is was not. The solder came off of the gold pads very easily. Is there something we can change in the reflow profile?