Rene,
A very fun tune. Great arrangement. Pretty cool string work. Excellent vocals and overall very well composed tune.
On critical side, I think it's not the volume of strings, it is an overall balance between musical bed and vocals. I think vocals can be a little more upfront. But that's just my amateur opinion. Nice one and thank you for sharing.

Misha.

P.S. I am exploring couple of plugins that do sidechaining. Ha...While I was typing this I went back and saw that you are using Trackspacer smile So here goes. I have Trackspacer too and I love it for fast sketches. However, what I find limiting is that you can not select specific "ranges" on it. You can only do upper or lower EQ spectrums and that often "eats" away other stuff. One of the plugins that I have is by Melda called MSpectralDynamics. It is a monster of a plugin, but a bit complex. So I am exploring it to do more advance ducking than Trackspacer offers.