It could be worth trying a (much) faster attack time, and a lower
ratio combined with lower threshold. Compression is not just about the number of dBs, it
is about when those dBs of compression are doing their thing.
Often you have
to combine compressors to get the characteristics you're after. If you really want to
clamp a sound a single compressor might not get you there. I'll often use one compressor
to lift the low-level detail and a second to handle the peaks. A limiter might also be
Quite extreme for a clarinet though!
I dare say if you
can supply an example for us to hear we can provide more targetted advice.
An Eagle for an Emperor, A Kestrel for a Knave.