You are trying too hard. You'll get where you are going to eventually, but you have to remember that you go gliding for fun. It's not the RAF and neither is it an airline. A reasonable landing is good enough. Reasonable speed control is also good enough. What you have to have cracked is good trim control and an excellent lookout (then the rest will be easy, as you will see). Amazingly, good trim control is obtained by all things, a good lookout. Why? Because when you get to your target attitude, you hold it visually (not by using ANY instrument) and move the trim to zero the trim forces. I'll also bet a pound to a penny that you hold the control column with a fierce grip. How should you hold it? Just like you'd hold a smelly old tramp's willy - finger tips only!
PM