Then add one sixteenth note which will now make the 4/4 pattern a bar of 17/16.

After you’re comfortable with this, play it over a quarter note pulse (4/4). This begins a cycle of seventeen bars within the quarter note pulse. On the eighteenth bar of 4/4, the cycle of seventeen bars begins again. One bar of 4/4 contains 16, sixteenth notes, so as the 17/16 moves through the 4/4. its first beats shifts hack one sixteenth note per bar of 4/4. Repeat this until you can count 4/4 (1-e-and-a, 2-e-and-a, etc.), while playing the 17/16 and do the same with the 7/8 over 4/4. The counting will help you to coordinate your mind and limbs.
Try this one:

You’ll notice this is the same 17/16 pattern but with the ‘addition of some thirty-second notes. Don’t let the thirty-second notes intimidate you. It’s easier to play than it looks. 4/4 equals 8/8.8/8 + 9/8= 17/8… still a pulse of 17, but easier to read.