G'day mate, welcome to the forum.
Sounds like what you need to do is go back to the basic rudiments, there's no substitute for them when it comes to developing technique, control and speed. Different rudiments and exercises work differently for different people, but the basic single stroke roll, double stroke roll and parradiddle are generally regarded as being the fundamentals.
As far as technique goes, I don't believe there's any technique you "should" practice, so long as is feels comfortable and fluid. Whatever you do at the minute, I'd continue to work on, if that is what feels comfortable. High speeds can be achieved with a multitude of techniques; all wrist, finger motion, push pull, they can all achiever high speeds with enough work.
Pretty much the most important thing is you understand and resign yourself to the fact that there's no substitute for practice. If you want your single stroke rolls to be faster, work on single stroke rolls. Sounds simple, hey? That's all there is to it.
Good luck and keep us updated on your progress.
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