Balanced(Lossy) is automatically set at 90% compression to give you the best compression while maintaining image quality as best we can. If you'd rather see more compression and less quality, you can adjust Lossy higher to 95% or lower to 65%.
1. Open Crush.pics and click Settings in the top right corner
2. Under Balanced(Lossy), click Change compression quality level
3. In the popup, adjust the slider to the percentage you would like
Note: This will only affect images compressed after this. If they are already compressed and within 30 days of their original compression, you can revert the images to their original version and compress them again with the new method.
See these guides: