speedline

[Charlie1988]

hi there ive only been climbing 2 years just learnt off of youtube and trial n error and ive got a row of willows to do about 15 the trees are leaning right over some brick buildings and i was thinking about using a speedline

 

ive got a row of large conifers infront of the buildings and grass area i will need to constantly move the speedline my end is it best to use a 3to1 tensioning point and lock off with a portarap them use a running tag line to control the speed at the groundsman end then my end just a karabiner around tree back onto rope or a running bowline ?

 

and is it neccassary to have a running tag line to control speed why not just let it fly ?