Strap/safety belt recommendations?

Hello everyone! I recently bought a sling ([calexotics the queen harness](and dildo([calexotics twisted dong](But the suction cup on the dildo (base diameter is 44 mm) are filmy and fall out of every loop I’ve tried. The problem is: my girlfriend has said she likes the one I bought but I’ve been thinking about buying a different harness. Not sure what to go with it, I know a body mount would work with it but This would limit other toy types in the future, I’ve also been considering a spare joque but I’m worried about this dildo. My other option is to try to find a different similar dildo that is more compatible with the harness, my only concern is I bought the harness with the waist belt attached to the O Rings. This may be the problem overall. I’ve tried elastic rings and metal rings with no success. Any other suggestions are welcome, I just don’t want to spend $200+ on a few harnesses and no exercise haha.

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