If you are already experiencing engagement problems, at this point bleeding won't help...the slace cylinder is already bad (internal rubber deteriorated). Replace to slave (stock Mazda p/u), and completely replace the fluid. I use dot 5, for 2 years now and no more problems. Some don't believe in dot 5 for a clutch, but I have the proof in the pudding...
Any automotive or transmission shop can do it if you don't feel you can...good luck!