Hey there!
I personally use 60-100mg to have a break through. At first (early 201
I was using like 35 to 50mg and still had amazing journeys. I do have to warn though if you just jump from 15 to 100 mg you might not be as prepared, and again this is just from personal experience, I get lots of anxiety before bigger doses and sometimes it makes the journey it bit chaotic and hard to remember.
And if you feel like you aren't ready just stick to the dose your mind feels is right and wait until you feel comfortable upping your dose. Sometimes I don't even use my scale when I meditate and if I don't break through I still enjoy the music and the positive energy I get while meditating.
Well I hope all that mess helps
I seen you didn't have a reply so I thought why not. Peace and love to you!