Wheelies, flip plates and covering your plates are the only way to avoid charges. It is illegal, so remember that if you choose to do so. I used to take the 407 every day in my car, had over 4000 dollars in 407 bills (adds up very quickly). It cut an hour off my commute each way. It's highway robbery, pun intended.
They will charge you the video toll charge, unless you call in and speed doesn't effect the cameras at all. I'm pretty sure SWIM (someone who isn't me), may have broken a record for top speed past one of the cameras and it still came up in the bill. We are talking twice the legal hwy limit. The hwy 7 entrance in Pickering is straight. If you do things to avoid getting nailed with charges and use the same ramps every day at certain times... OPP's special detachment that strictly works as hwy 407 traffic enforcement will indeed get you.