Here's what I think. The reason you don't progress is that you have an unuseful practice routine.
The only way to improve you reading skills is to practice daily or at lease 4 times a week. Try practicing 10 min a day and see where it leads you.
Another suggestiong is that you turn to Alfred Basic's library to play more musical pieces that will inspire you. Thompson is sometimes tireding and unmusical.
Last but not least, play sheet from our website and check out the video demonstration to see how we play them. This definately helps to understand what you're reading much faster. Here's a page for example: Classical music sheet for beginners