i had the exact same issue as eggs when i first started, the time it takes from the ground to reach my ear made it slightly out, and was always confused as to why when i recorded, it sounded out, even though when i played at clubs and recording it was fine. At the clubs they usuaally have a monitor in a very good spot, usually ear level, however at home i had to have the speakers at on the ground so i just did the mixing in my cans using the master and line volumes to differentiate the two tracks