Walkthrough how to setup WSJTX with the Firmware Version 1.4 or higher.
alternative method to tuning ALC is to enable transmit and call CQ instead of tune
Links:
Icom Manual - https://icomuk.co.uk/files/icom/PDF/productManual/IC-7300_ENG_Basic_0.pdf
Icom Drivers : https://www.icomjapan.com/lineup/products/IC-7300_USA/?open=4#drivers
WSJTX - https://physics.princeton.edu/pulsar/k1jt/wsjtx.html
Written Guide - (not 1.4 but still has information relevant to this) - https://k5tmt.com/2019/09/07/wsjt-x-settings-for-the-ic-7300/