Problems with the perineum tab

I've tried two different models, and, with both, have an issue with the shape or size of the perineum tab. I seem to have a "seam" from my scrotum to my anus, and the tab pushes, rubs and irritates it (I've tried lubing it, withdrawing it a bit), eventually causing so much irritation, almost pain, that I have to give up.

It looks as though the new, larger model has a ball-shaped tab, but...be honest, looks a bit too big for me.

Any advice on this issue, I have had some really nice sensations, so, would like to continue with this, if a solution exists!

Thanks.