A tale o' a sore arse

Maybe you should look at the problem holistically rather than focusing on saddles/shorts.

If your bike fit is poor this may cause problems. Perhaps your putting too much pressure on you nadgers because of the position on your bike (saddle too high/low/forward/tilted, etc).

A bike fit would also help in other areas (avoiding injury to tendons, maximising power, etc).

I've been slowly moving my saddles forward to get my butt on the wide bit rather than sitting on the nose and getting pressure on the soft tissue. Knees are way forward of the pedal spindle, but it is more comfortable for me. Recently added a very slight nose down tilt too and that is also helping.

Should add that I do spend most of my riding time on the drops.

A good LBS will likely have some test saddles that you can borrow for a time period. Fizik provide their authorised dealers with a range of bright yellow ones, all you will need to provide is a valid payment card number as security.

I think Bontrager have a buy once/ swap for another policy on their saddles.

depends where the chaffing occurs.
If at the vertu top inside edge of the thigh I've found that saddles which are mostly
flat from center to nose with a small kick up at the tail stop this particular chaffing
when set flat from the center forward ... fabric's scoop flat elite and shallow elite are
my current fav (on 4 bikes so far !!! used their online sizing page)
Saddle setup can cause issues when swapping from mtb to road etc.
The angle on my mtb is much more nose up than the road bikes. sounds odd but
i think it's purely position on the bike, i.e. you're more upright on the hybrid/mtb.

try playing with the angle of the saddle, good shorts and chamois cream first

I ride the Selle Italia X1 saddle. Nothing special about it apart from it works for me.
I never understand trading off comfort for weight on a saddle.

Saddles with a decent centre cut out or no nose saddles are best type, they instantly remove central pressure, place weight upon sit bones, then its just a case of time cycling shorter trips initially till you adapt.

Firstly, more padding is probably not the answer. Your rear will sink in to the saddle resulting in more pressure on the sensitive areas. Your sit bones really need to perch on a saddle, your bum should not really envelope the saddle.

OK.. so you bought a Spesh BG saddle, was this after being measured up on their fitting system?

If so, you probably have the right saddle and just need hours in the saddle. In this instance you may need to look at your shorts and chamois cream the areas that chaff. If you were not measured when you bought the saddle then i would advise that you get this done before doing anything else.

Saddles are very personal. One mans armchair is another mans razor blade. I stumbled upon a saddle that works for me and swiftly bought 3 of them. Summer bike, winter bike and one for taking away for hire bikes.