So I'm assuming you're trying to use these on your G spot for that type of orgasm?
I did read the reviews for the Diamond and a few people said that it was too small to really reach it well.
The rabbit and the scoop aren't really designed for that, but I guess in a pinch the scoop maybe could be used for that. I'm not sure how comfortable it would be to have little nubs right on your G spot though. It's also important to have good pressure, if that thing is flexible it probably isn't the best tool for it. The rabbit needs a curve to it because the G spot is on the front wall a couple inches into your vagina.
Honestly I find that with enough manual stimulation with my middle finger (since it's longest) on the G spot I can have a G spot orgasm. But you have to build up to it. Try using a vibe for a while - build up with the scoop or the rabbit. Once you feel pretty aroused, check in there to see if the area has swelled up (another forum member described it as a "squishy walnut") and massage it for a while with your finger. That worked for me.
Good luck, hope that helps?