If I could offer you only 2 tips which will massively Improve you finds and STOP large Iron making coins and rings etc seeem non-existent, then It wouild be...well 3 actually:
1: Do not bother with some people's "spexcily named/made up programs
2:
Turn Iron bias fe1 to ZERO
Same with FE2 - set It to ZERO
If you would like I can make a video proving my 1000% FACT, that setting Iron bias to zero, thus giving YOU the decision If It's a good target or not.....stock/standard Iron bias of 6 I guarantee blocks out completely a LOT of good Ir or not, Rather than Setting 6 as standard on NOX, I know for a FACT....It will tell you stacks of times that there IIS nothing there, but setting It to zero I KNOW will increase your finds 500%.
Matt