Hey there! I'd say a 1:06.481 is still pretty early to switch to 8MT, usually I would recommend getting at least a 1:05 with 6MT before making the switch. Here's an old video of mine that kinda displays the 6MT strat a bit better:
https://www.youtube.com/watch?v=SRjKuki5ISoAs for 8MT, the basic strat is to go around the corner, do a left, a-tech right, normal right, as displayed here:
https://www.youtube.com/watch?v=zSObNA1OCYMWhat you really have to focus on this is spreading (thus spacing) out the MiniTurbos properly in order to make proper use of the extra miniturbos you'd do compared to 6MT. And also of course as always: Maintain the best racing lines possible.
With both 6MT and 8MT, the timing of the a-tech will be a bit tricky to get down properly so keep experimenting with it.
Eventually at the higher level of 8MT it's pretty standard to do a little bit of a-tech on almost every MiniTurbo, but try to focus on nailing the basic stuff first, that should already get you towards a mid 1:04.
Good luck!
[Also you might want to learn the new Baby Park flap strat to be able to drive pretty easy 8.6s in your PRs]