I think that right now, the best whipping BDSM are these from Dr Lomp ELITEPAIN : equivalent to Makar for the Crucifixion.
Dr. Lomp BDSM really makes whipping scenes with genuine pain and blood and more recently he added a final torture after the whipping session :
a spray of salt water mixture highly concentrated in NaCl especially on chosen wounded and bloody parts of the slave !!
One example : "Cards of Pain" series, the video "cards of pain Special rules", after tens and tens lash strokes, watch and hear her screams @ 1 hr 13 min 50 secs ;
she cried at the end, with real tears, notice the way she watched the sky : maybe she hopes God will give her the strength to bear this ordeal because in Czech, people are poor and these girls accept lot of torture to get back money to home ; see at @URL :
https://fr.spankbang.com/4i5mv/video/cards+of+pain+special+rules .
And you have the counterpart @ Cards of Pain #8 when the former slave girl tortures the former dominatrix girl ! @ 55 mn 22 sec.
Theses girls desserve lot of respect because it's not fainted pain ! Indeed, ELITEPAIN is the sole BDSM producer wich does not use lydocaïn in order to get the maximum screams and tears. They bear suffering and know that men and girls will masturbate by watching it and get orgasm and jerking-off. Actually, their pain is symmetric to the pleasure of watcher and their pain is the necessary thing to provide joy to others. Maybe a Zero Sum Game as economists say ???