The X line mono is what I would call a starter brush similar to the Gardiner super lite, they're ok if your short on confidence or
experience but if you really want to speed up while having as easy a working day as possible then you have to get onto the Gardiner Xtreme brushes, just try not to over scrub as there's no need and it will needlessly shorten their lifespan.
Xtreme medium mixed for windows and the stiff for fsg cleans.