even a tiny tilt change can have a huge affect on how the saddle feels when forward or in the drops. If the saddle setback works for you, a small tilt change might not affect how it feels when riding on the hoods.
But that's if the setback is at a good spot.
If you feel like you;re sliding forward then the tilt is either too much or the combo of setback and tilt just won;t allow you to get there on that saddle.
As for saddle width
If this is the bontrager/trek color code
http://www.bikegallery.com/blog/wp-c...seat-chart.png
then I'd guess, Red = 130mm, Yellow = 143, Blue =155

I can ride (and do...) a lot of different saddles, but the ones I prefer the most have a minimum of padding under the sit bones and the saddle base/shape is such that it drops off rapidly just forward of the place the sitzbones are perched. But thatz me...
That said, the Selle Italia XO Trans AM, noted as an older model MTB saddle, (146 width, works great pour moi) is more padded than I normally go for, but was surprised how nice it is and have done bunches of 80 to 120 mi rides on it... the cutout really works on this saddle
easy to find new on ebay

Also, if you don;t set the equipment to a position which works for you, it'll all get bunched up and be part of the problem...
The Polish cycling team pic should prolly get inserted here...