Bar 28 it is possible to use full planting in the first stages of the repeat material (see bar 28), try and get your thumb down when you play I M A fingers, and I M A down when you play the thumb, and so forth. This technique will become second nature with enough practice and will help secure the accuracy of the RH placement. Be aware at a slow tempo it will sound staccato, but once up to speed there should be no difference in sound continuity.
Bar 33 onwards, the diminished chords part 1, will require the RH thumb to really dance back and forth between strings 5 & 6. Practice this slow at first to gain facility; and once semi-secure build in to it a feeling of being relaxed. Do not tense up the RH to achieve this.
Bar 48 is a simple I M A then P motion of the RH. It is possible to use planting here, however then main reason for highlighting this diminished section (and its following idea as well) is to point out that its easy to cut off the bass notes here. Make sure that they sound out. The tendency in this section is to rush the chord changes, please don’t, take your time and give each note its fair length.