Looks like a good tool but, in reality, the OP's issue appears to be achieving a full vacuum when bagging and there doesn't appear to be any problems with identifying the fact that the bag is leaking

If the through-bag connector itself is air-tight and sealed, then it'll likely just be a case of refining the bagging technique. If there is any doubt over the metal through-bag connectors, then it might be an idea to just try a silicone one, which might prove to be a bit more straightforward in terms of sealing. This might help eliminate one potential issue, at least

If looking to use vacuum pressure to aid consolidation on a skinning job, I'd also be awake to the possibility of the fabric being pulled and crimped by the bag, especially if there are quite a few angles to the part. It might work out okay, but it sounds like getting the fabric to lay=down neatly could be difficult to control

I'll seal up every conector,  putty the bag connector and keep trying... the bag tape ain't cheap lol.

One big problem that people will face with bag seals, is that if U r using too Slippery releasing agent. Then the bag seal wont hold. Example with Flex-Z series releasing agents. if U r using number 3, its easy to get bag to seal. but 4, 5, 6 are hard. Those are just too slippery and it wont hold the vacuum.