Slink combo for deep trainers?

I’m looking to buy a slink toy or two, I want to work on correcting my s-bends so I can get bigger toys deeper. The longest toy I’m currently using is the Abyss 2 by Nothosaur, it’s 23 inches long and 7 inches in circumference at its widest point near the base of the ball. I can hold it without any trouble but it’s very soft so it doesn’t really flex anything inside me. The thickest toy I’ve used is 10 inches long and 8 1/2 inches in circumference and I can only get about halfway through it. I hate to regret buying such an expensive toy so I’m looking for advice. I’m planning on getting a large Vortex slink which looks similar in size to the Abyss 2 but it gets wider much faster. I think this toy will help me get started and be a stepping stone. I’m also looking at the Slink XL which is 20 inches long and 10 inches in circumference at its widest point. This will try and do the stretching exercises properly. I’m paying quite a bit for shipping so it’s better to buy both toys at once rather than buying them separately.

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