Using AutoHotkey, I'm trying to remap the function keys to their secondary function as default and the default as the secondary

I'm trying to remap the function keys to their secondary function as a default nut I'm running into a few issued in the code. One thing to note is that, in my keyboard driver software, I can switch the Fn key to be a right windows key so I can avoid the low level coding issues involved with the Fn key.

I have written the following and the first bunch of hotkeys seem to work fine:

RightWindowsDown := 0
F1::Send {Volume_Mute}
F2::Send {Volume_Down}
F3::Send {Volume_Up}
F4::Send {Launch_App2}
F5::Send {Media_Play_Pause}
F6::Send {Media_Stop}
F7::Send {Media_Prev}
F8::Send {Media_Next}
F9::Send {Launch_App1}
RWin::
{
    RightWindowsDown:=1
    soundbeep
}
If (RightWindowsDown = 1)
{
    F1::F1
    F2::F2
    F3::F3
    F4::F4
    F5::F5
    F6::F6
    F7::F7
    F8::F8
    F9::F9
}
return

However, when I press the RWin key, it just spams the normal F1 key and opens up a load of help pages. Any ideas on how I can avoid this?