It shoots too much water coffee come out watery

It can be that the beans are just of weak taste. Also, you should be able to set your coffee to a smaller size, which means that less water will be added.

I'd suggest you try tamping with a bit more pressure, watery coffee is typically the result of water getting "around" the ground coffee as opposed to getting forced through it.

The grind on the coffee might be too coarse and instead of making espresso its coming out like drip coffee because the water is running through it too fast.

Make sure you push the lid down all the way before putting the clamp down on the front.

I've noticed that the back of the lid on my vivy (t12) can get stuck up (even with the clamp down) causing the water jet to not be inserted all the way - which produced very weak coffee.

I think you have minimum 2 problems with this machine. The leakage could be from the thermoblock, and you might have to change this. And, the watery coffee is from the grinder is worn out, this also needs to be changed.
Sorry!

If these rules are not heeded, then one will get anything
but a perfect espresso, because:
if the amount of ground coffee is less than 7 grams
an insufficient amount exists for extraction weak and watery
if the grain size distribution is too coarse
neither the solid nor the colloidal parts will be extracted weak and watery
if the ground coffee is not compacted
the colloidal parts will not be extracted weak and watery
if the coffee is too coarsely ground weak, watery, barely aromatic, sour, bitter
considerably less than 25% will be extracted and unpleasant, the aftertaste will not last long
if the water temperature is less than 97 Degrees Celsius
the extraction will be reduced predominantly sour
if the water does not have a minimum pressure of 9 bar
the colloidal particles will not be able to be extracted predominantly bitter
if the water temperature is much above 97 Degrees Celsius
the coffee will become scorched during the extraction bitter and woody, will smell charred

its a science and trial and error to get the right/perfect cup. due to where u live (atmospheric pressure) and temp/humidity. read this for a better understanding

http://www.coffeekid.com/files/2/xproject.pdf

1, Check the grind on the grinder. Imagine grounds as rocks and sand, if you are using rocks then the water will run too fast and with sand it will run too slow.
2, If using an automatic machine(water volumes are pre-measured), check to make sure that you are getting the correct volume(3ozs fro a 2ozs shot, and 4ozs for a 3ozs shot), an once of water stays in the coffee during extraction.
3, Adjust the tamp(packing pressure) of the coffee, fill the portafilter with coffee a little over the top, then level it out and tamp to the fill ring on the inside of the basket.

After reviewing troubleshooting diagrams, I really couldn't find a solution to your problem.

The only thing I can suggest is to use 2 oz per pot of coffee grounds. Your 5 or 6 scoops assuming they are one ounce each is way more than enough.

Look under where your basket goes. Most bunn coffee maker has a flavor guard on the downspout. this down spout actually helps distributes the water over the whole basket of coffee grounds. Most of the time I see these missing, and when they are gone, they are gone.

Use less water for the amount of coffee you are using first. Sadly when there is not enough water, the coffee tastes bitter. Too much water tastes weak. Hot water extracts certain elements out of the beans even after grinding.

Always use a fresh paperfilter designed for your coffee maker.
If this pot is not work correctly still, I will suggest seeing your appliance repair technician.

Sounds like you're not packing the coffee tightly enough into the unit. You've got to tamp it quite tightly...that's why the pumps are so strong. Each 'atmosphere' is 15 pounds of pressure. My son also likes to make his by doing two double loads to get one espresso cup.

Have you tried cleaning it with the 64 ounces of white vinegar?
Read your booklet if you still have it. Pour the vinegar in run it through until it ask for more water to be added and just let it sit overnight or at least 8 hours. Then flush it out with fresh water at least two or three of your water tanks should do it. Then give it a try again.
Just a suggestion if you haven't tried that yet. Hope it helps.