Anet A6 3D printer

I've been struggling and getting nowhere for about the last 2 weeks. I decided to try a locally produced LW-PLA.
 
I just can't get it right, I can only get about a 10% reduction in weight. When I try and print anything the feed stops part way through.
I'm at my wits end.
I can't believe I managed to print an entire plane. I'm about to try and use some of my precious Esun LW-PLA, of which I have very little, to see if the problem might be the material.

Let's see, motherboard upgraded to from SKR V1.3 to SKR V1.4, changed the home printed PLA 'X' carriage back to the Anet aluminium one, modified the Anet carriage to take, first my home turned e3d type feed block, then my old e3d feed block. When that didn't work I bought and fitted a new e3d feed block like Simons, I even fitted new Bowden feed pipes. Granted I did find a feed problem with the filament pinch lever loosening over time (3 hours) which I fixed. I have been in regular contact with DaVinci labs over this and they convinced me that the problem was my settings. Others on their web site rave over this stuff. It's called Way Less by a company called Fil X in Cape Town. None of my rolls have any instruction sheet included (as referred to on the spool) but they sent me what should have been in the package. This gives me temperatures and flow rates, any increase in temperature and feeding stops, any decrease in flow rate (to get the required wall thickness (aka weight) and feeding stops.
Load shedding and home commitments don't help of course. I was about to return everything to the specification that I used for the Seagull (a large job) when I I thought, bugger it, let me put the Esun LW-PLA in that I used for the Seagull (still to be maidened) 

Eureka! Having been convinced that the was nothing wrong with the new filament the tried and trusted works fine. Thanks for the input Simon, I pre-empted you by about 3 hours.
 

I'm having a problem with the thinner sections of wing, trailing edge printed vertically, I noticed that it tends to happen where the part approaches the front (open) section of the bed so I decided the fully enclose my printer.
 
We'll see if that works.

Enclosing the bed area didn't help
 
I noticed that Cura had an update, 5.4 so I've switched to it.
 
Lots of stringing but usable.

As previously reported I moved from Cura 5.1 to Cura 5.4. The print quality has improved dramatically, one of the improvements is the 'bridging'
 
At the top is the component printed with Cura 5.4, a dramatic improvement.

Well I've got some long prints waiting, on the weekend the change over to an alternate schedule gave me an opportunity for a 14 hour print. Only to discover that part of the brim wouldn't adhere! I've lost count of the times I've re-leveled the Bed, changed the first layer thickness and anything else I could think of, suddenly, yesterday I had a bed heating error, touching the plug at the back of the bed brought the power back on, the 2 red wires had overheated and were now making intermittent contact.
As a point of interest, there are 2 red (+) feeders and 2 black (-) feeders to carry the 10 amp current. In the bed itself there are 2 heating elements with no internal connection between them. One heats the outer section of the bed and the other the inner. Obviously while the fault was intermittent the outer section wasn't warming, accounting for the loss of sticktion.
Some work with a soldering iron and it's now hard wired.

If the WIRES are overheating, perhaps you need a heavier gauge for the feeder?
Or did you mean the  - presumably clamp - joiner was overheating?

Note to self, 'be clearer'
The female part of the plug is not fit for purpose, there's nothing wrong with the wires.
 
The view from the top.
 
from left to right, 2 positives , thermister wires, 2 negatives
 
Here you can see the resistive connection has caused localised overheating.

OH! Those dinky little crimped things, meant for a few milliamps at 5v - for linking modules on circuit boards! (also used as balance plugs on smaller lipo's!)
It looks like either the springy bit on the pin has gone, or the socket has spread slightly, and has been arcing.

Yup they expect each one to carry 5 amps! No sign of heating on the pin, just the socket. Being hardened copper, once it's reached any kind of temperature, it's gone! No spring left.

Mary was upset with me for buying down market, I've been looking lustfully at the Prusa 3