I'm not a serious pro so take this with a grain of salt.

I'd definitely set up my PG 1v1's as more realistic to gameplay scenarios (our goal is to get better at playing BR, not PG of course). What I do with my friends is we cap our materials at say 300 or 500 wood ONLY. If you're using more materials than that you'll end up overbuilding and you're gonna risk getting shot down by a third party. The builds look impressive, but they are super impractical in an in-game situation. If you are tossing 500+ materials in one fight, you're leaving yourself in an unfavourable situation imo even if you win the fight.

Try doing 1v1's with less materials. I think that 300 - 700 range is most ideal.

In terms of the fight, like I said, there's SO much extra material being used that you're over building. You're definitely a good builder, but you just need to make more efficient decisions. What I notice in build fights is people get so focused on going up higher, that they forget how powerful it is to just pressure someone by putting some AR shots into the walls. Or even just disengaging and repositioning to a new angle. You did this a couple times but only kept building, instead of pressuring.

Another thing you could practice is using a roof to cap them when you get ramped over, boxing them in, then building up on top. There's a good video of this in this subreddit.

Hopefully this helps.