This is pretty normal for the bigger boards. Keep your weight (feet) further forward and lean the rig forward a little more when you want to turn the nose more downwind. When you tack, you have to lean the sail forward a bit and use one foot in front of the mast to push it around through the wind.
When you beach start, the first foot on the board must land on the center line of the board as far forward as possible (its a big step), and as soon as you get your second foot on the board, move both feet forward near the mast. The step up is tough because of the long fin and being in deeper water. Most people learning step too far back on the board and on the rail rather than the center line.
It doesn't take long to overcome this issue with some practice.
Formula 160; iSonic 111; HiFly Move 105; Tiga 263; '85 Mistral Superlight.
Maui Sails TR 11.0; 9.2; 8.4; 7.6; 6.6; Maui Sails Switch 6.0; 5.2; Maui Sails Global 4.5; 4.0.