Depends on the track honestly, and a combination of how i'm feeling at the time and what place i'm in as well! When i'm in first I mostly just hold on to items (although sometimes I backspam literally everything if I feel like it loool), and when i'm in mid places I tend to do the same out of fear of getting a TC
For securing a position or lead for a short term, I go all out with the backspamming and trapping of tight corners. When i'm gaining positions, I snipe everyone indiscriminately, there is no way that it is supposed to be a 'friendly' contest when the goal is to win. It's still friendly, but holding back for weaker players is not what defines being "friendly" in this case.