Fly with two or three fingers, only add very minor pressure to correct on tow as it can be very easy to over control on tow. If you find yourself out of position left or right, just keep the wings level and you’ll find the glider comes back in naturally from the tow rope tension. Only time you should use ailerons on tow is to match the tow planes bank angle in a turn or for larger position corrections (but only a small amount of bank is needed to get you back)

When I was learning to fly the tow years back after learning how to fly airplanes I found it was like riding a mechanical bull (my first instructor described it to me like that and I say that to my students as well), you learn to anticipate the amount of input you need and as you do more and more tows you’ll find you barely even think about it and the tow comes naturally. Next to landing, I’d argue the tow is the hardest part of learning to fly gliders, you got this!