I can only think of 6, what are the ones you're thinking of? I never use a boost-BR at the start of this track, but there's 1; then the top of the hill; bottom of the hill; tunnel; 1 off the jump and then using the speed to get another off the bump in the track ahead.

I'm yet to get around to this week's challenge, but I've been playing a bit of wipeout for a change recently (uploading times to the global site, says I'm now the #1 WOHD player overall in Australia, woo - this is despite my patheticness at Zone, Detonator, and Phantom ) so I'll get a time in later.