HI ParaRiddle666,
Before we talk about playing fast paradidles, how is your single and double strok roll? Please remember a paradidle is made up of a single stroke and a double stroke.
When you are playing these rudiments, regardless of the tempo, do they sound clean?
If you are playing the single stroke roll, does both hands sound the same? Is the left hand softer than the right, if your are right handed? Can you play fast at low volume? This test you how much of control you have.
When you are playing double stroke roll, does the 2nd note sound the same as the first note? does it sound like TA-TA, TA-TA; or TA-ta, TA-ta? You should be able to ensure that both notes sound the same.
Keep working on these two basic and important rudiment before you worry about how your paradidle sound like. I assure you, once you have these rudiments sounding good, paradidle is nothing to you.
On paradidle, one of the way to play it is to accent the 1st 16th note and the rest of the 16th notes unaccented. You may also play it unaccented for all the notes, or accent the 1st two 16 notes. I will advice you to learn how to play the paradidle without the accents to get a better control of your hands. Work with Stick Control book to improve your technique.
Lastly, use a metronome when you practice. It will improve your timing and accuracy. Don't just use it to measure how fast you can play. Remember that you have to play with no tension. Remember to always relax. Also, accuracy of note value is more important than speed. Eventually, speed will come.
Cheers....