diff --git a/frontend/src/utils/IchimokuCloudPlugin.ts b/frontend/src/utils/IchimokuCloudPlugin.ts
index a6da9ee..1dc76cd 100644
--- a/frontend/src/utils/IchimokuCloudPlugin.ts
+++ b/frontend/src/utils/IchimokuCloudPlugin.ts
@@ -71,18 +71,14 @@ class CloudRenderer implements IPrimitivePaneRenderer {
 
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     target.useBitmapCoordinateSpace(({ context: ctx, horizontalPixelRatio: hpr, verticalPixelRatio: vpr }: any) => {
-      // 첫 번째 데이터 포인트 좌표 확인
-      const d0 = this._data[0];
-      const d1 = this._data[1];
-      const tx0 = timeScale.timeToCoordinate(d0.time as Time);
-      const tx1 = timeScale.timeToCoordinate(d1.time as Time);
-      const ay0 = this._series.priceToCoordinate(d0.spanA);
-      const by0 = this._series.priceToCoordinate(d0.spanB);
-      console.log('[IchimokuCloud] coords: x0=', tx0, 'x1=', tx1,
-        'spanA_price=', d0.spanA, 'spanA_y=', ay0,
-        'spanB_price=', d0.spanB, 'spanB_y=', by0,
-        'hpr=', hpr, 'vpr=', vpr,
-        'canvas_w=', ctx.canvas?.width, 'canvas_h=', ctx.canvas?.height);
+      // spanA/spanB 차이 진단
+      const maxPriceDiff = Math.max(...this._data.map(d => Math.abs(d.spanA - d.spanB)));
+      const mid = this._data[Math.floor(this._data.length / 2)];
+      const last = this._data[this._data.length - 1];
+      console.log('[IchimokuCloud] DATA CHECK: maxPriceDiff=', maxPriceDiff,
+        '| mid[', Math.floor(this._data.length / 2), '] spanA=', mid.spanA, 'spanB=', mid.spanB,
+        '| last spanA=', last.spanA, 'spanB=', last.spanB,
+        'canvas_w=', ctx.canvas?.width, 'canvas_h=', ctx.canvas?.height, 'hpr=', hpr, 'vpr=', vpr);
 
       let drawn = 0, skippedTime = 0, skippedPrice = 0;
       for (let i = 0; i < this._data.length - 1; i++) {