Use the side cutters, needle files and sandpaper/polishing sticks more
and use the sharp blades less.
Carving away at a model with a knife is reminiscent of 7 - 9 year old boys
using a semi-sharp pocket knife to build an Airfix 1/72 Spitfire (sold in a plastic bag).
I still have that pocket knife somewhere, I had learned to sharpen it so it was
razor sharp when my 9 year older brother wanted to borrow it.
I warned him that it was ‘sharp as h*ll’, he said ‘Yeah, yeah …’
and five minutes later he came complaining, with a bleeding finger,
about the ‘effing sharp blade’.
I answered: I told you so …
When a knife is absolutely needed, use scalpel blades mounted in flat handles:
These blades are NOT to be used for heavier cutting, such as sprues.
Use side cutters or maybe saws for the heavy work.