making waves without frying (Prohair)

Hello hair geniuses....

I tried an experiment curling my hair today, but I need advice on how to improve the outcome.  I know we've determined that hot rollers work really well on monofiber.  Unfortunately, my real hair falls straight in about an hour or two when I use hot rollers.  For me, those flexi-rod curlers and setting lotion overnight are the way to go.  I used six large rods, spritzed setting lotion, and spiral-wrapped them.  In the morning, I applied a little heat with my dryer to help the synth curl, too.

When I took my hair out of the rollers, it actually looked pretty good...more wavy than curly.  A friend of mine said I looked like Kate Beckinsale, which I took as a great compliment.  However, the synth hilights didn't wave very well.  I'd love suggestions on how to make it come out a little better tomorrow. 

One idea I had was to use a couple more curlers (maybe eight total), and apply heat for a longer period of time in the morning.  Another idea would be to touch up the Prohair with a large curling iron, but I'm afraid of frying it.  What do you think?

I've had luck with a curling iron on low, fwiw.

I think I'm going to try the thermal setting spray next time.  I like hot rollers, and would love it if they'd hold longer.  While it's not a beauty supply store, I took a peek at Longs (for some reason, my local one carries a ton of Matrix, Paul Mitchell, Redken, etc.), but I didn't see any setting spray.  Of course, some products have such odd names (especially the Tigi ones) that I wasn't sure what they're for.

I might also do some curling iron experiments on some extra PH first, rather than risk the extensions on my head.