Are Linn Tukans a bit on the bright side?

I have a new used all-Linn system with Tukans biamped with a Majik (bass) and an LK85 (tweeter), and noticed that, particularly after biamping, the Tukans sound ever so slightly bright/unforgiving/harsh at the top end (e.g. soprano voices). This made me wonder the following:

1. Are Tukans known to have a bright sound, or is it perhaps the components I'm using?

2. Is the brightness a result of biamping?

3. Is there a tweeter adjustment that can be made to mitigate top-end harshness?

4. Are there interconnects that could help (I'm using Linn's standard analogue interconnects but thinking about picking up some Linn silvers)? Any recommendations within reason?

5. Would a sub help?

Thanks.