Your comments about the position of the bits of blue tape certainly suggest that your weight is too far forward. Bill's suggestion is definitely a simple, effective way to change the trim of the kayak before you do anything drastic.

It is common practice to fit the seat in a kayak so that it can be moved fore and aft. That makes it possible to adjust for different size paddlers and different preferences.

How much do you weigh? Sometimes a paddler who is outside the range for which the kayak was designed can find it doesn't behave quite as it should.

It should be possible to fix your problem. I found my Night Heron had good tracking in spite of the fact that at 63 kg, I am significantly lighter than the ideal weight for a NH.