I have a few questions. Why use an Emulsion (non reservoir) shock? Having the reservoir not only adds more fluid, it separates where the dividing piston is for the nitrogen & shock oil. Emulsion shocks are known to heat fade much quicker then a reservoir shock, and eventually allow the oil & nitrogen to mix. Is adding a reservoir an option?
Also in the past Bilstein has only offered external adjustability when using their by-pass tube shock. Do these have any external adjustability?
The bright yellow part of the shocks, is that some sort of bump stop cup or is it acting as a coil guide to keep the coil from rubbing and possibly binding with the end of the shock? Is it made of Urethane?
Eibach springs are good! Do you have optional spring rates for different weight vehicles?
With reducing the CV angle (which is a good thing) I'm assuming you are reducing the rear wheel travel by about 1/2 inch?
Bilsteins keep the gas and oil separated making for a more consistent, cooler running shock that resists fade. Could be wrong but in most cases reservoirs only add nitrogen capacity which can aid longer travel shocks maintain overall pressure. Have run quite a few reservoir style shocks with schrades for checking and filling nitrogen level. of course it will depend on the MFG., but it's been my experience that if you check the level and you have a mix of gas and oil it can indicate internal seal failure. Nitrogen is a very heat stable gas, with larger molecules, that why may racers use it in their tires for more consistent tire pressure at varying track and tire temps. but to answer your question remote resevoirs can be ordered.
As for external adjustments, being familiar with how the unique valving in the Bilstein works I took the attitude, ( like many auto mfg's do). If you know the specifics of the vehicle, weight, bias etc. then there should be no problem tuning a shock for overall performance. Personally thought that the stock set up was completely opposite to what the XP needed. Not everyone is a shock Guru, and I felt that many might be making matters worse trying to make adjustments.
Beyond that I think having a well tuned shock with less mechanical components and failure points adds up to highly durable set up. So no knobs.
The Bilstein is a true 8" travel shock. The requirements for the XP is more along the line of 7" overall. So I designed a external shock body extension (Bright Yellow Part) to match those requirement, (straight forward and effective). As for correcting the axle angle I calculated that loss and adjusted it at the extension, plus added a little.
The Eibach has a proven reputation, is highly consistent and keeping the overall length matched to the travel required for the shock eliminates side loading and spring bang on the shock body.
Please take a moment to check out the Bilstein site, it gives great insight to why their shocks work so well.