Inconsistent first layer on the extremities on a vcore pro with newest ratos

[cyan elk]

Hello everyone, so i rebuilt my vcore pro and then tried with the ratos defaults to print a large 300x300 grid finity tray on the 315x310 build area, but the corners were not consistent
I thought maybe the issue were the conservative edge coordinates of the beacon, so i spent more time today fine tuning the max stepper x,y size and maxing out the z_tilt/bed mesh coordinates

i redid the compensation mesh and installed a 2504AC instead of my old ratrig generic steppers

[brave lynx]

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[cyan elk]

those are 60x60 squares on all edges

thats my height map, nothing out of the ordinary if you ask me

and im using

[z_tilt]
z_positions = 
    0,0
    150,315
    315,0
points = 
    15,0
    158,285
    300,0

[bed_mesh]
mesh_min = 15,25
mesh_max = 300,305
probe_count = 11,11

[stepper_z]
microsteps: 16

[stepper_z1]
microsteps: 16

[stepper_z2]
microsteps: 16

[printer]
max_z_velocity: 15
max_z_accel: 60

console log of the print

thats what i tried

[earnest moss]

1. What toolhead are you using? Please share a few photos, notably showing the beacon and nozzle relationship,.
2. Does the configured beacon offset match the physical reality?
3. What is your gantry made of (alu?)? Please share a few photos of the printer overall.
4. What heatsoaking are you performing?

[cyan elk]

i thought i had nailed down the issue to a wobbly z axis/instable

thats why i modded the original xy joiners to add some spring loaded nuts into a 420mm extrusion for extra stiffness

which did lower my score on the poke test from 7 or so to 3

its a vcore pro frame, with longer z rails for a roughly 300x300x400 size

that was before my fix

its the ratrig toolhead 1.0 with a rapido uhf, so it should be all good?

That's now

i played around/asked gemini for some thoughts/ideas, it tweaked my beacon/ztilt values for some other probing points
thats a cold mesh

and thats the ratos mesh from the last square test with a fresh comp mehs

for the heatsoak im doing

[gcode_macro RatOS]
variable_beacon_adaptive_heat_soak: True
variable_bed_heat_soak_time: 300

[cyan elk]

im trying again now without any of my custom z_tilt, bed_mesh positions 🤔

[cyan elk]

I guess my y extrusions are not parallel?
Or bowed/twisted idk

That's with vcore pro defaults

Left middle and left top

[cyan elk]

Seems to me that the issue was a too low heatsoak time