Well guys turns out the reason the speed doesnt work correctly is because wdp made a big balls up. The solenoid requires 5.8v while the battery is only giving out 4.5v. This is why the speed works brilliantly just after you have charged it but after a short period of time everything starts screwing up.
edit: not sure if this applies to the A4 but i did hear that wdp are working on a new solenoid or have a new solenoid.
edit: not sure if this applies to the A4 but i did hear that wdp are working on a new solenoid or have a new solenoid.