It seems to me that you are tensing up when playing with your thumb. You are supposed to relax, when using your thumb on the strong beats (1st & 3rd) of each measure. It is useful to practice in stages for any triplets in the development section, measures 103-122.
Stage II would practice RH alone, dropping my wrist every 3 eighth notes, counting every eighth (1-2-3 1-2-3…), where eighth=66. I would also try to use some exercises. For instance: for measure 115:
1) Playing G-B-G B-G-B G-B-G B-G-B using 1-2-1 2-1-2 1-2-1 2-1-2
2) Playing G-D-G D-G-D G-D-G D-G-D using 1-4-1 4-1-4 1-4-1 4-1-4
Your objective is to match the sound between different fingers and find the most comfortable position for your hand and fingers on the keys.
When you feel more comfortable and you are satisfied with your sound, practice the same measure the way it's written. Then use the same exercise for other trouble spots.
Stage IIStill practicing RH alone, gradually increasing the tempo and flexing your wrist every 6 notes. Make sure that you are relaxed and able to control your sound.
Stage IIIPracticing hands together, starting in slower tempo, flexing every 3 notes in the right hand, and then in faster tempos flexing every 6 notes.
I hope this would help you to overcome the technical challenges. Good Luck!
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