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Those three Hyperions are all a nice crop for the Mak. The typical magnification limit for a scope is usually given as 50X per inch of aperture. BUT, 60X is not unrealistic, & I take it as the upper limit just to suit the scope I've got. So a 5mm wouldn't be out of the question for a 6" Mak, if it's got good optics.
There's a more limiting factor though, & that is the atmosphere. Typical upper limit is around 120 to 150X. Good conditions will allow 250X. Exceptional conditions 400X, or more - but not too often. I use my 8" SCT for the Moon & planets. Not often I can use my 5mm Hyperion to get to 400X, but for those occasions when I can, I'm glad I've got it. You can use fine tuning rings, but the problem with these is you will introduce dust into the EP, & it means more stuffing around in the dark. I considered them too, but didn't go with them. But others have & are happy with them.
Also, don't dismiss low power with your Mak. Longer focal length EPs work well with them too. Only thing you need to be mindful of is the size of the bore in the back of the scope - if it is smaller than the clear field aperture (field stop) of the EP, you'll see what is called vignetting, which is a softening of the edge if the field of view instead of seeing a nice sharp edge. Some people scream blue bloody murder if they see this. Bit silly really this reaction. If it happens, & it bugs you, well, just use a shorter focal length EP, or one with a smaller apparent field of view.
Mental.
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