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12psi is grim as is 20psi for your weight unless its a particularly horrific mud track with minimal nasty rocks.
Don't get an angleset as it'll make your bike slacker and pull the bars back to you. If you want to get more cockpit fit an offset headset and you'll gain 6mm reach and a marginally longer wheelbase.
I'd run a 50mm stem and keep bar width the same for now whilst pushing the saddle back as far as it'll go if the bikes too small.
I ride a Zerode with a custom milled 60mm stem as they are tiny bikes and it's absolutely fine down Champery DH so I'd argue it's rider skill and a normal psi that needs to be addressed.
No point getting used to super low psi's as when you change it up to something more normal you probably won't like the feel of your tyres.
I'd say setting your tyres to 30psi and then adjusting by feel is the way to go.
What size Enduro 29 are you running? And how tall are you?
Would be interesting to see if your coach was talking BS, and has just made you change for no reason.
As rickon said.
You sounded happy with the bike before making some changes to aid with jumps?
I guess the obvious question to also ask is have the changes had the desired effects with the jumps? As in helped with them?
EDIT: Best to change one thing at a time I would think too. Tyre pressure, see how it rides. Tyre pressure back to normal then try stem by itself before mixing the 2 up?
Have to say that the large change in stem length gets my vote as a possible issue for you perhaps.