It depends a bit of the Version. First Generation 2013 Monarch was quite progressive and even riding hard and with 90 kg it was difficult to find a Setting to get it responsive and to be able to use the travel. A big air can did make it better - I tried.
The 2014 Monarch is totally different (stock mounted model, custom Version for PYGA), that works quite well. So assume if you ride that Version you will not have any probs to find an appropriate Setting - as you set.
I have been told DebonAir std Version would not fit very well to the Oneten/Onetwenty, but maybe the changed to DebonAir as for the Oneforty for the actual models. But would be very likely a custom Version of the DebonAir then.