diff --git a/tools/ca3-v4-amend/pc1-ca4-packs.ps1 b/tools/ca3-v4-amend/pc1-ca4-packs.ps1
index fa23405da..b2ba938d8 100644
--- a/tools/ca3-v4-amend/pc1-ca4-packs.ps1
+++ b/tools/ca3-v4-amend/pc1-ca4-packs.ps1
@@ -24,7 +24,9 @@ if (-not $inst) { 'RESULT error no installed igneum-worker-cuda.exe'; Summary 'f
 $exe = Join-Path $inst 'igneum-worker-cuda.exe'
 # mx8_shl256x27 is the research lane's first per-load export (id 854050a4293f0615, the known-failed record: 11 percent duplicate reads from a lossy
 # base writer under the sub-blocks) and mx8_shl256x27_v2 its fix (counter-asic-4 2f718001, attempt 3, id bd64b207a30413fb); both run and every row
-# names its pack directory and the program id read from its program.json
+# names its pack directory and the program id read from its program.json. 22:44 UTC: the research lane's acceptance rule, judging the per-load
+# class in execution order, refuses the 16 x 27 construction on every attempt, so neither per-load export is a candidate class; both rows
+# still run as the energy reading of the placement and carry construction=unsound-energy-reading-only
 $packOrder = @('mx8-genesis', 'mx8_sh256x27', 'mx8_shl256x27', 'mx8_shl256x27_v2', 'mx8_mm128', 'mx8_mm512', 'mx8_mm1430')
 foreach ($pk in $packOrder) { $d = Join-Path $packs $pk; if (-not (Test-Path $d)) { "RESULT error pack missing at $d"; Summary 'failed' @{ error = "pack $pk missing" }; exit 2 }; foreach ($f in (Get-ChildItem $d -File | Sort-Object Name)) { "RESULT kitfile $pk/$($f.Name) sha256 $((Get-FileHash -Algorithm SHA256 $f.FullName).Hash.ToLower())" } }
 "RESULT start $(Stamp) job=$jobName exe=$exe sha256=$((Get-FileHash -Algorithm SHA256 $exe).Hash.ToLower()) label=ca4-research"
@@ -76,7 +78,8 @@ function RunState([string] $state) {
     $wi = Mean ($w | Where-Object { $_.Count -ge 8 -and $_[6] -match '^\s*[\d.]+\s*$' } | ForEach-Object { $_[6] }); $wa = Mean ($w | Where-Object { $_.Count -ge 8 -and $_[7] -match '^\s*[\d.]+\s*$' } | ForEach-Object { $_[7] })
     $eff = if ($watts -and $mhs) { [math]::Round([double]$mhs / $watts, 4) } else { '' }
     $err = ''; if (-not $res -or $rc -ne 0) { $e = ($lines | Where-Object { $_ -match 'FAIL|error|MISMATCH|compile' } | Select-Object -First 1); $err = if ($e) { ($e -replace '\s+', ' ') } else { "exit $rc, no RESULT line" } }
-    "RESULT ca4-research pack=$pk dir=$d program_id=$pid class=$cls state=$state mhs=$mhs watts=$watts watts_instant=$wi watts_average=$wa mh_per_w=$eff sm_mhz=$sm mem_mhz=$mem util=$util fingerprint=$fp check=$check exit=$rc wall_s=$([int]($t1 - $t0).TotalSeconds) samples=$($w.Count) error=$err"
+    $tag = if ($pk -like 'mx8_shl256x27*') { ' construction=unsound-energy-reading-only' } else { '' }
+    "RESULT ca4-research pack=$pk dir=$d program_id=$pid class=$cls$tag state=$state mhs=$mhs watts=$watts watts_instant=$wi watts_average=$wa mh_per_w=$eff sm_mhz=$sm mem_mhz=$mem util=$util fingerprint=$fp check=$check exit=$rc wall_s=$([int]($t1 - $t0).TotalSeconds) samples=$($w.Count) error=$err"
     Start-Sleep -Seconds 3
   }
   "RESULT packs-state $state end $(Stamp)"