Advice re climbing in Cordillera Real, Bolivia required

[El Perro Negro]

Am looking for advice re acclimatisation for the first week after arrival in La Paz.

Also interested in access and quality mountain routes up to and including AD. Trying to avoid normal routes if possible.

Have got Brain's and Biggars guidebooks already. Good but would like to contact climbers who have already ventured and climbed there recently.