I've gone back and forth with a few SMPs and I'll say 3 things:
There is a real difference between the 2 different 'families'
If you try and plant your sitbones it won't work. You need to find support under the 'rocking chair' bones (the ischium?)
Small differences in location and angle make a really big difference.
Colby Pearce has a couple of really good articles on SMPs (google 'Colby Pearce SMP'), but 1 nugget really stood out for me: if you start riding on one and it's great, but gets uncomfortable after a while, that's often a sign that you're on the right saddle but it's in the wrong place. If that's the case, seeing an SMP literate fitter would be a good option.
The other thing I've found is that if you don't engage your glutes and core and just 'collapse' your soft tissue into the saddle, then just about anything is uncomfortable. I had recurring saddle sores in the 'gutters' at the front (sorry for gross terminology) until I worked hard on this. My thought process or cue was trying to align my pelvic angle and my shoulder angle. It wasn't a visual thing but a feeling or thought process. Don't know if that's helpful but good luck.
I've gone back and forth with a few SMPs and I'll say 3 things:
Colby Pearce has a couple of really good articles on SMPs (google 'Colby Pearce SMP'), but 1 nugget really stood out for me: if you start riding on one and it's great, but gets uncomfortable after a while, that's often a sign that you're on the right saddle but it's in the wrong place. If that's the case, seeing an SMP literate fitter would be a good option.
The other thing I've found is that if you don't engage your glutes and core and just 'collapse' your soft tissue into the saddle, then just about anything is uncomfortable. I had recurring saddle sores in the 'gutters' at the front (sorry for gross terminology) until I worked hard on this. My thought process or cue was trying to align my pelvic angle and my shoulder angle. It wasn't a visual thing but a feeling or thought process. Don't know if that's helpful but good luck.