I wouldn't bother about trying to get it perfect, if you're that anal you've probably already replaced the suspension. ESA suits a majority of riders who are too lazy to adjust and just ride. My boss goes out for a ride just to set his suspension up... he wouldn't be satisfied. My last KTM with normal suspension, I told the shop there were some fundamental issues, so they got it more ball park and then I just rode it. I can adapt my riding to the suspension anyway.
Remember that on a GS Adventure the weight of the fuel alone stuffs up the suspension settings. 30kg difference in fuel between full and almost empty would do that...
Warning: My post quality varies according to my mood. If I sound sane give it a few minutes and I'll be back to normal