Are the road books top secret or can they be shared around/purchased?
Did you use one of the road books from these French guys ?
http://vibraction.pagesperso-orange.fr/espagne/espagne.htm
I need to take my XC up there - I took my now ex- Husaberg last year over near Sort and loved it bit I reckon the XC would be spot on up on those trails.
Re the road books, I'm not sure where Les got them, but I do know they were off the net and cost about 80 euros.
Whilst they could certainly be shared around, they are reasonably fragile (think christmas paper chains!) and could easily tear if they were constantly being manhandled.
Re the best bike for the spanish trails ... most (I'd say as much as 90%) of the trails
that we did were smooth fast flowing stuff with quite a loose dusty surface. We didn't see much mud, and as we got higher the stony surface got bigger and lumpier in parts. There were only a couple of sections that I found really challenging for the GSA, and they were mostly pure rock beds that needed loose arms, eyes locked onto that keyhole of light ahead and a bit of speed and momentum to keep you driving over the rough stuff.
It's certainly an environment where a bigger bike can use it's grunt and you can have fun over all the water bars.
A small 250 wouldn't have the grunt and top end that makes the flowing trails such fun, and the big 1200's / 990's limit your flick flack and are also a bit of a handful on the loose surface in the corners.
If you think of your average trail ride in Blighty with ruts, divets, mud ... a 250 / 350 is often the perfect power / weight / flik flak bike.
Out there, a 650 / 690 is perfect - plenty of speed and grunt for those lovely sweeping fast flowing bits (the majority) but not too heavy to stop and turn on the loose mountain edge corners.
This sort of corner below is typical - easy up hill on the bigger bikes, bit of a squirt on the gas and squirrel the back end round a bit to square it off, but a bit of a handful on the way down with all that weight. Loose all yer speed in the straights and make sure you're tipping it in on a nicely balanced throttle and driving it rather than pushing the front and carrying too much speed.
650 / 690 .. perfect.