Currently I own a large Whyte s-150crs v2 (link is the aluminium version, but the geo is the same). I've upgraded the rear shock with an EXT Storia and added higher rise bars. Stock otherwise. It has a 56.6 degree head angle.
After recently trying out a Transition Patrol at the bike, I was blown away by the confidence and fun I had with the much slacker head tube angle (63.5 degrees), despite it being a medium size when I should be on a large.
There is technically an extra 10mm of travel on each shock over my bike, but otherwise the Transition seems to be almost identical geo wise to my Whyte, ignoring the head tube and seat tube angles. The chain stay and reach are almost identical for example.
After riding that bike down our bike park, I thought about trying one of those Work Components angle headsets to slacken my bike by 1 or 1.5 or 2 degrees! And then lengthen my Pike form from 150mm to 160mm of travel, which should help it mostly maintain the same geo in other areas. Doing this with a 2 degrees angle headset would probably slacken my head angle to about 63.1 degree head angle. Might be a bit steeper (63.5), not 100% sure how all the calculations work in the end.
Works components is a great company. I have had several of their headsets and are found on top dh pros bikes. If you are unsure of what fits your bike email him your specs