diff --git a/mxpic_router/builder.py b/mxpic_router/builder.py
index e5f1cb8..553d97f 100644
--- a/mxpic_router/builder.py
+++ b/mxpic_router/builder.py
@@ -268,9 +268,20 @@ def _allows_pdk_ports_as_pins(pdk_root: str) -> bool:
     return "/opt_pdk_public/" in f"{normalized}/" or "/opt_pdk_atlas/" in f"{normalized}/"
 
 
-def _metal_route_pcb_enabled(xsection: str) -> bool:
-    normalized = str(xsection or "").strip().lower().replace("-", "_")
-    return normalized in {"metal_1", "metal1", "metal_2", "metal2"}
+def _route_pcb_enabled(link: LinkSpec) -> bool:
+    return str(getattr(link, "family", "") or "").strip().lower() == "electrical"
+
+
+def _route_ordered_pins_for_automatic_link(link: LinkSpec, pin1, pin2):
+    if len(link.points or []) >= 2:
+        return pin1, pin2
+    point1 = _pin_point(pin1)
+    point2 = _pin_point(pin2)
+    if point1 is None or point2 is None:
+        return pin1, pin2
+    if point1["x"] > point2["x"]:
+        return pin2, pin1
+    return pin1, pin2
 
 
 def _route_bundle_links(links: list, pin_map: dict, Route, warnings: list) -> None:
@@ -282,6 +293,7 @@ def _route_bundle_links(links: list, pin_map: dict, Route, warnings: list) -> No
         if p1 is None or p2 is None:
             by_order[order] = {"link": link, "adjusted_points": None}
             continue
+        p1, p2 = _route_ordered_pins_for_automatic_link(link, p1, p2)
         points = _route_spacing_reference_points(link, p1, p2)
         if len(points) < 2:
             by_order[order] = {"link": link, "adjusted_points": None, "adjusted_offset": None}
@@ -335,7 +347,7 @@ def _route_bundle_links(links: list, pin_map: dict, Route, warnings: list) -> No
                 radius=plan["link"].radius or 10,
                 width=plan["link"].width,
                 xs=plan["link"].xsection,
-                PCB=_metal_route_pcb_enabled(plan["link"].xsection),
+                PCB=_route_pcb_enabled(plan["link"]),
             )
             if plan.get("automatic"):
                 if _route_guided_straight_link(plan["link"], route, warnings, plan["adjusted_points"]):
@@ -473,7 +485,7 @@ def _route_direction_sign(delta: float) -> int:
 
 
 def _sbend_span_bucket(value: float) -> int:
-    return round(float(value) / ROUTE_SBEND_GROUP_SPAN_GRID)
+    return math.floor(float(value) / ROUTE_SBEND_GROUP_SPAN_GRID)
 
 
 def _route_group_needs_spacing(group: list) -> bool:
@@ -727,7 +739,7 @@ def _point_segment_distance(point: dict, start: dict, end: dict) -> float:
 
 
 def _route_link(link: LinkSpec, pin_map: dict, Route, warnings: list, route_options: dict = None) -> None:
-    route = Route(radius=link.radius or 10, width=link.width, xs=link.xsection, PCB=_metal_route_pcb_enabled(link.xsection))
+    route = Route(radius=link.radius or 10, width=link.width, xs=link.xsection, PCB=_route_pcb_enabled(link))
     p1 = pin_map.get((link.src_inst, link.src_pin))
     p2 = pin_map.get((link.dst_inst, link.dst_pin))
     has_pin_endpoints = bool(link.src_inst or link.src_pin or link.dst_inst or link.dst_pin)
@@ -744,6 +756,7 @@ def _route_link(link: LinkSpec, pin_map: dict, Route, warnings: list, route_opti
     if p1 is None or p2 is None:
         warnings.append(f"Missing route pin for {link.src_inst}:{link.src_pin} -> {link.dst_inst}:{link.dst_pin}")
         return
+    p1, p2 = _route_ordered_pins_for_automatic_link(link, p1, p2)
     method_name = _route_method_name_for_pins(p1, p2)
     route_method = getattr(route, method_name, None)
     if route_method is None: