I would recommend the Saber 100:1 Amsoil for your weed trimmer. Use that with a little quickshot in the gas and you will see a differance in the performance.
I know this is an old old post but I thought I would follow up anyways. Did you find the dealer that you were looking for or aren’t you interested any more. Please let me know if you need anything I am a local Amsoil dealer.