Pleased it's working for you, they're not a bad little computer overall.
I found I couldn't hear the mosquito alarms with a hood on either, it's not very loud. If you're paying proper attention to your dive you won't need audible alarms to draw your attention to what you should already be aware of anyway.
My new computer a Dive Rite Nitek Q, has no audible alarms and frankly I've not missed them at all.
Don't obsess about the ascent rate alarm too much, if you're already ascending to begin with and you raise your arm too quickly it can trigger a warning even if your actual ascent rate is fine. It's one of the drawbacks to a wrist mounted computer. As long as your overall ascent rate is OK it's not worth stressing over.
BTW - if you're handy with a soldering Iron and don't want to pay for the suunto download cable. Here is a link to a DIY interface for downloading your dive profiles.
Roli's PC Interface for Suunto Dive Computers
I used the serial port design for many years and eventually paired it with a Serial to Usb adaptor.
The connector to the dive computer contacts is the tricky part.
The solution for me with the Mosquito was the use of a recycled computer floppy drive power plug and a couple of bent metal pins like below - nice and snug connection.
These days for dive profile logging I like subsurface:
Subsurface | An open source divelog
It should work fine with the Mosquito - It did for me.
Have fun.