How do you descend without increasing air speed?
Hi Charles and welcome aboard.
Lowering the collective will allow you to descend, without having to drop the nose of the helo too much and that should help prevent the speed getting away from you.
If you are using the governor, that should also drop the throttle, but if not, you will need to reduce it yourself, to keep the RPM needle in the green.
Cheers
Paul
Got it tks for the response.
how to delete a post after reading
If you click on the 3 horizontal dots, underneath and to the right of the message in question, a number of icons should appear and look for the one that is shaped like a dustbin.
Should is right for it did not show.
Then it looks like it’s a level thing. If you can edit the post, just change the text to something like “delete me” and I’ll make it go away. 
Cheers
Paul