You're really getting stuck in! I'm ashamed to say I have no zero knowledge/experience of anything you've mentioned except the remap; one of mine had a Hirsch remap (and no other mods) and it wasn't ideal. The boost spiked massively and then dropped away sharply so it drove a bit like a diesel and loved to taunt the traction control/eat tyres.
You're really getting stuck in! I'm ashamed to say I have no zero knowledge/experience of anything you've mentioned except the remap; one of mine had a Hirsch remap (and no other mods) and it wasn't ideal. The boost spiked massively and then dropped away sharply so it drove a bit like a diesel and loved to taunt the traction control/eat tyres.