That is Beautiful, as someone who raced DH on the original Heckler back in the 90's when the first Fox coils came out and the Marzocchi Bomber on the front with dual coils and an oil bath system it was a total game changer. I am on the same page, I have the Fox 36 out front and its fine but the DHX2 is next on the list. I talked with some of the techs at Santa Cruz about why they spec Rock Shock coils on the Bullit and they are claiming they have more mid stroke support. Think your idea of going with a stiffer coil or better yet a Progressive coil, my last bike had a DVO Jade with a 475-575 and it was awesome. Appreciate the pics, when you get the 38 on front post some more. I went with the gray but the Avocado has grown on me and with your color scheme your bike looks great. I just sold my Ibis Mojo HD 5, have over 300 miles now and the Heckler is going to serve all my needs currently.
If you have not seen the MRP kits they make one for the DHX2, it might just do the trick for what you are listing there are some links below for the springs and spacer kit to fit the DHX 2. A friend of mine owns Cascade Components and they make links that allow you to run longer shocks, increase travel and adjusts the progressiveness. They made a link for the previous Heckler, I am trying to get them to make one for our bikes but they want me to send my bike to the in Washington... Reach out to them as the more request they get the more likely they are to get it done.
MRP Progressive Springs are the only non-linear shock springs on the market for trail and all-mountain/enduro riding. Progressive Springs increase in rate late in stroke to provide additional bottom-out support and open up the use of coil shocks on frames previously only suited to air shocks...
thelostco.com
The Coil Spring Spacer kits allow MRP springs (Enduro SL, Progressive, and Standard Steel) to be used on both MRP shocks and those from other manufacturers. There are six kits available.
thelostco.com
Cascade Components Bronson link
The Cascade Components V4 Bronson link has the big bike energy you have been looking for. The stock V4 Bronson suspension has been improved over the V3 Bronson, but we figured we would throw even more progression at it for excellent traction and bottom out resistance. A Cascade Components...
cascadecomponents.bike