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I recommend you this paper : https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8599307/ Particularly : "mtDNA% ranges from 5% or less in tissues with low energy requirements up to ∼30% in the heart due to the high energy demand of cardiomyocytes" So it depends on your tissue but your percentages are in the acceptable range.
You're right and I don't see any paper that studied the subject in greater depth, but I believe the percentage should be lower. An exemple here in Fig 2D : https://genomemedicine.biomedcentral.com/articles/10.1186/s13073-021-00941-8 "the percentage of mitochondrial genes sequenced in the nucleus-containing droplets was lower than the cell-containing particles (2.7% and 4.2%, respectively)" and they filtered out nuclei with >20% mitochondrial gene counts.
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