There is not 1 single sound of the 80s that I can't get with the Kemper....the chorus is all but thin. Some more info on your setup and which Chorus are you using?
I seem to get too much chorus and have to tame it quit a bit, but I use with stereo tracks.
Another one here who fonds the chorus often needs taming rather than being weak.
If I need more of that 80's chorus sound I like to combine chorus and pitch shift fx. Also a good amount of delay and reverb and I'm in Heaven ... or Run To You 
Where in the chain are you placing the chorus in the chain and what settings are you using?
I have to keep my chorus (or any mod effect, really) at a very low mix. Otherwise it's overpowering.
Maybe this video can help you out:
Not sure it it's just me but I find the Chorus on the KPA very weak - there is very little depth and just doesn't do it for me - fine when you want a subtle amount but when I need a lot it just can't quite get there.
Any tips before I go and buy a separate chorus pedal?
Think along the lines of "Run to You" by Brian Adams and all that 80's stuff where chorus was heavily used.
Thanks
exactly where do you place the Chorus and what are your Outputs set to in the OUTPUT section?
As with others, I have a fabulous lush chorus I think it’s a variety of the vintage chorus effect and it’s in the X slot
