For me the biggest antagonist for saddle sores is loose fitting boxer type pants.
I find I don’t get any rubbing / chafing at all with decent tighter fitting pants dare I say it even the y fronted type.
I have tried many pads and find these don’t help personally. Loose shorts, tight pants is how I roll. However my milage limit is generally 40-50 which is less than you so may need another approach.
I find cycling shorts with a chamois are more comfortable, but primarily because tight undies with no chamois would have to be super tight in order not to bunch up after a while. Also Y fronts have a seam that you can end up sitting on.
However, I tend to agree with the sentiment that a huge thick pad isn’t necessarily more comfortable, as long as it stops bunching up.