Welcome to Wattflyer Mikee. Someone more heli experinced should check in here, too, but I'll throw in my 2 cents. I have limited RC heli experience (a couple of cx rotors and an MSR) but lots of sim time and book-smarts. It sounds like the normal effect of the tailrotor. It's not only counteracting the torque from the main rotor, but it is a propeller pushing to the left. So it's another one of the multitudes of forces acting on a heli.
I read somewhere it's actually acommon term among full scale heli pilots, when asked 'how ya' doin?', to respond 'left skid low', meaning all's normal, since their tail rotor is pushing them to the right, so they need a little left cyclic to counteract it in hover, and hence the left skid low attitude.
I even experience this with my little MSR.
Happy flying! (And be carefull in that basement. Any heli bigger than the micros make me nervous!)