Tried this configuration by doubling the compactors and level
opts.BlockCacheSize = 10 << 20
opts.NumCompactors = 8
opts.MaxLevels = 14
This did not help with the write speeds. Taking 40-60 seconds to write a single block.
It also did not let me revert to the older levels
panic: runtime error: index out of range [13] with length 7
We also tried by turning the compression off, this did not give a major impact, taking 25-30 seconds to write a block.
One more thing that we noticed was that it took 30 minutes just to open the DB.