ive had a crack at a very similar scope. now i can tell you this
get good at star testing.! my first step.
using a VERY WELL COLLMINATED LASER POINTER to make sure the focuser tube is square to the middle of the front corrector plate. it will not come back to the center of the laser pointer if the front corrector plate isn't square with focuser.
The next step aligns the primary with the front corrector plate and because of the previous step aligns the light cone/convergence point with the focuser.
then get a reasonably bright star so you can see the diffraction rings and adjust the hex head bolts for the primary mirror untill your heart is content!. this is the only way to do it as any other method i have tried does not allow for any other mechanical problems (focuser tubes ect ect)
Its not easy and is painful, but once you have done it once then it will be easy as!