Hi everyone!

I'm a bit new to cycling, currently riding a cheap triban bike, pretty heavy, weighed at 11.45kg, I'd like to buy a new frame to build a better bike

I'm not riding a lot yet, I'm running 8 times/week, but I start adding some cycling in my training plan with my coach.
I might increase the volume during the season, and why not try to do some races during the summer !
There is not much running races during summer so I think doing more cycling from april to summer could be something i'd keep above years.
Anyway,
I did a static bike fit cause I was scared to not choose the right frame size

, as I'm always in between sizes when looking at rider height.
I'm about 177cm, so 5'10" for 68kg.
The bike shop gave me two report, with geometry for a comfort position and one or a competition position. I'm adding the pics.

I think i'll more look into the competition position, as my bike has been fitted according to this and I still feel pretty comfortable on the short rides I did (didn't ad the 20mm on stem yet).
What makes me doubt now, is that I see most people saying to go the lower size when you are in between.
However if I look at the stack, it's always way lower than I have on the report. Even when looking at the upper size, it's still lower and looks like I'll need spacers, but in this case i'm afraid not to have margin to lower the stack.
Do you think that the bike fit is reliable? it was shimano bike ft dynamic lab, smth like this (
https://bikefitting.com/fr)
Or maybe that the position they gave me is not that agressive and I could go with lower stack ? Reach on most of these agressive frames are lower than on my report though
I was for example looking at speeder r55, winspace t1150-gen2 M (381 reach, 535 stack), or L (388 R, 560.5 S). Yoeleo r12 for 900€ looks like a really good option to me, as their sizing is in between with 54 frame (386 R, 550 S).
I Might go for this one, it's almost exactly in-between reach and stack of tarmac sl8, their calculator gives me either 54 or 56cmby changing only 1cm.
Now there are some thing I'm not sure, for example, what stem length should I choose ? On the bike fit report I don't understand which reach of the handlebar is used. It looks like 80mm is standard but idk.
Also if the saddle has offset I should add this offset to the reach to calculate stem length ? A bit the same problem with less steep seat tube angle.
What I like on yoeleo is that we can choose between integrated handlebar and separated stem and bar. Integrated looks clean but I think that separate would be a more wise choice. As a beginner, i could easily try different fit, and maintenance would be easier, especially if I let cables outside. What do you think ?
a stem is only 20€ at decathlon, about the same weight as the carbon one though, so wondering why pay for a carbon.
But the handlebar coming separated is only 64mm reach, so i guess i should add 10mm to stem ? The longest is 120mm though...

. As for angle, it's 10°, a bit more than 7° on the one-piece, so it highers the stack ?
I'm trying to understand how geometry works

I think I'll try to take a photo of myself on my bike with current position to see if I'm low. Because I'm in ideal stack according to the fit, but I don't feel like I am very low. Even if I lack 2cm on stem.
We could easily put me in the right position while my bike which is a
triban rc500 M with endurance geometry, kinda weird..

Anyway, I'd appreciate any advice or suggestion

about sizing or even frames

I already ordered the farsports wheelset