GeneratePress + UberMenu3

Greetings Tom and Leo, I have missed a step in integrating UberMenu3 with GPP and would very much appreciate any guidance you can offer.

I used this which the developer Chris provides for GP:
/* Stop the theme from filtering the menu output */
add_action( 'wp_head' , 'stop_generatepress_menu_filter' );
function stop_generatepress_menu_filter(){
remove_filter( 'walker_nav_menu_start_el', 'generate_nav_dropdown', 10, 4 );
}

I was able to set the top level nav colors in the UberMenu panel in Customizer but lost the ability to control nav colors on the page level using the Page Header > Advanced controls.

The UberMenu developer kindly offered these suggestions, but alas they did not help:

.generate-merged-header #masthead .ubermenu.ubermenu-main .ubermenu-item-level-0 > .ubermenu-target{
color:white;
}

.post-id-8 #masthead .ubermenu.ubermenu-main .ubermenu-item-level-0 > .ubermenu-target{
color:white;
}

#masthead .ubermenu.ubermenu-main .ubermenu-item-level-0 > .ubermenu-target{
color:white;
}

My URL is https://pathmark.goldenvistaresort.com/

Both GeneratePress and UberMenu are exceptional products with top-tier developers. Clearly I am the weak link. Any help would be deeply appreciated.

Gary