OK, I'll bite on this question after having read your post over in "Non-Gardening Related Hoo-ha and Foo"-
How do I get my plants in the long run to grow up, not so much out, but become tall and robust?
I know you are incredibly frustrated. I get that way myself too and have a few threads out there where no one has helped me. It happens, it's the nature of the beast and sometimes people don't post for a multitude of reasons and not being able to answer the question comes to mind top of the list. People do care, most don't want to worsen another gardener's situation by trying to answer a question on a plant with which they have little or no familiarity or experience.
Here are my thoughts- You might need to consider purchasing a variety that has the form you are looking for. Purchasing a variety that blooms on new wood is an option too as you could prune to your hearts content and still get blooms the next year. If you prune the hydrangeas you bought to fit the location you planted them in or your vision of what shape you want them to take upon maturity, you're going to have issues. I believe you stated in another thread that you purchased Forever Summer hydrangeas. There is no such cultivar. 'Endless summer', 'For Ever and Ever', and 'Bailmer Endless Summer' appear to be valid hydrangea cultivars. I believe those are all cultivars of Hydrangea macrophylla. Hydrangea macrophylla blooms on old wood. Not good to try to prune a species that blooms on old wood as you won't get any blooms the next year. Interestingly enough, 'Endless Summer' blooms on old wood but can also bloom on new wood. I don't know much about the other two cultivars but suspect they bloom on old wood and might possibly also bloom on new wood.
Much of the appeal of the macrophylla cultivars is the form they take because of their prolific blooms drooping to the ground. That's why I bought my 'Endless Summer' and that's why friends have bought their 'Endless Summer' hydrangeas. I have no idea how one would go about staking one. Too many branches and one might end up doing damage to the root system if one poked 10 stakes into the ground to support the blooms. I'm really racking my brain for you louie_vil_slugger and the only thing I can come up with might help next year but not this year. This is my idea for next year and you can tell me if you think it might work or not, ok? I have peony bushes, they do the same darn thing the 'Endless Summer' does but they do it in an area that I don't want them to do it in. I bought a few round tomato stake type deals. They're specially made for peony bushes so I think they might work for a drooping hydrangea. I could take a photo of them if you'd like. Anyway, I put them in place in early spring before the peony bushes started shooting up growth for the season and as they grew, I make it a point of keeping all the plant inside the ring. The resulting effect is that the whole plant is supported by this ring deal and nobody has to hop over it when they walk down that sidewalk. I think you could do the same thing next spring with your hydrangea only you'd have to do it before it leafed out. Right now you'd end up knocking off the blooms trying to gather it together to contain it or breaking branches trying to get them into a containment ring. Break off the branches on a macrophylla and no blooms next year.
Best wishes to you.