00:30:042 (1,2), 00:34:842 (1,2) - from rc guideline "Stacks are acceptable, but avoid switching between 1/1 and 1/2 stacks repeatedly. This may cause reading issues for new players, since two different rhythms are visually the same."
though these cases may not be fully relevant, but i think 1/1 stack is not necessary be used (since all other stacks are 1/2 in this diff