I find the B17 too wide for my bikes with drop bars.  On those I use either a Brooks Pro or Conquest.

But I can use a B17 or the Flyer on bikes where I am a bit more upright in posture.

Echoing PH, I'm not sure I can add much, but FWIW:

My Brooks B17 Premium is now 12 years old, maybe 20K kms. A few things I've done to make it reasonably comfortable:

Lubricant:  I use Obenauf's saddle oil sparingly (and apply it every other end-of-season) and only on the underside of the saddle. Seems to keep it flexible but not soft.  I use a saddle cover for protection against rain & heavy dew.

Saddle tilt: I tilt the nose downwards slightly, so that a short spirit level placed between the top of the nose & the rearmost of the three holes is level. Occasionally (usually in the spring), I tilt it another 3-4mm lower.

For me, the position of my bars is critical.  Took me some years to find the sweet spot: the top of the hoods on my drop bars is now 3 1/2 inches above the nose of the saddle.  That also allows me to use the drops in a headwind, without too much pressure on me delicate bits.

So, there's a lot of variables at play.  One thing seems to be a given, but which still necessitates adjustments:  as I get nearer the end of my eighth decade (77-plus journeys around the sun), my flexibility diminishes.  This, despite yoga twice weekly, and a daily hour of stretching my hips/quads/hamstrings.

Good luck -- a less-than-comfy saddle pretty much trumps "press on regardless".

As my B17 wore in it became wider.  The saddle was a little used s/h item so I can’t quote exact miles but probably after I had ridden it for 1000 miles it started to chaff my legs.  Tightening the saddle tension nut by about 1/2 turn narrowed it down again and solved the problem.  I marked the nut with a pen, just incase it was loosening.

Another solution is to add lacing along the bottom of the saddle to pull it a little inwards.

If you need a spanner to adjust the saddle just get a normal 13mm open ended spanner and ask a workshop to grind it narrower at the head.  It will loose some of it’s strength but it will do this job ok.

Which Brooks - they come in different widths? It's likely that the saddle width isn't a good match for your backside in the seating position you use. The B17 fits many touring cyclists who use a semi-upright position but, if you get your head down further then you need a narrower saddle.

Also, if you have a pressure on soft tissue problem, then try tilting the saddle to be slightly nose down. If you've formed a pair of sit bone depressions then you won't slide forwards. The 'carved' versions of the saddles (which have a slit along the middle) claim to provide some pressure relief.

 The saddle's fine, i haven't dammaged it   i used proper argentinian gaucho saddle oil and whenever i'm in a hostel i gave it a massage.
I had to take some high grit sand paper to the edging as it was chaffing baddly.  Sounds terrible, but the saddle's in great condition.
I've had a few ,000km where it was amazing so i know it's possible, but i've tried loads of different saddles and the brookes is the best of a bad lot.