Question 1..
I have 22 tasks for Milkyway@home from V21 all saying they'll be done in 7 minutes.

How can I get my BOINC manager to stop getting new tasks that take 8 hours, (I believe these new tasks are from V19) and run the ones that take only 7 minutes?

Question 2..
I was running 4 Milkyway@home tasks at once, I decided to add another Project to my boinc manager, but it caused my system to slow right up, (I did Climite Change) so I detached the project and now Milkyway is only running 2 tasks?? I have finished 2 and it started 2 more.

How can I get BOINC to run 4 Milkyway tasks at one time again?

Question 1..
I have 22 tasks for Milkyway@home from V21 all saying they'll be done in 7 minutes.

How can I get my BOINC manager to stop getting new tasks that take 8 hours, (I believe these new tasks are from V19) and run the ones that take only 7 minutes?

Go to the Milkyway project preferences and deactivate "use CPU".
The much faster running WUs you see are calculated on your GPU, not the CPU ;)

But then your CPU will idle, so you may opt to join another project to load also your CPU cores.

Question 2..
I was running 4 Milkyway@home tasks at once, I decided to add another Project to my boinc manager, but it caused my system to slow right up, (I did Climite Change) so I detached the project and now Milkyway is only running 2 tasks?? I have finished 2 and it started 2 more.

How can I get BOINC to run 4 Milkyway tasks at one time again?

No idea what you are seeing, but if you deactivate the CPU work and don't attach to another project you will finally see only a single Milkyway workunit running, because you have only one GPU to run it at. Maybe you just try a different project?

I have a Quad core CPU (Q6600).

it says Milkyway@home 0.19 by the ones that are running, the 22 7 minute ones say Milkyway@home 0.21

I assume the number at the end is the Version?

edit: it's now running 3 at once.
edit2: could it be as I turned the overclock off on my GPU? making my ATI 4850 to run at
GPU Clock - 500
Memory Clock - 750

instead of
GPU Clock - 665
Memory Clocl - 1015

I don't like my GPU running at 100°c unless I'm gaming, so I've deactivated the GPU usage, I want it to use only my CPU.

edit3: I've settled to crunching 2 at a time, as long as my Work points keep ticking over I don't mind too much. I thought this was all CPU usage, I didn't realise it was using my GPU too. my 4850 has old crap stock cooler on it so I don't want to stress it too much.