diff --git a/ops/fast_ops-inl.h b/ops/fast_ops-inl.h
index 2bfb889..0cec2f1 100644
--- a/ops/fast_ops-inl.h
+++ b/ops/fast_ops-inl.h
@@ -76,7 +76,8 @@ HWY_INLINE hn::Vec<D> FastSigmoid(D d, hn::Vec<D> val) {
   hn::Vec<D> b, c, d_coef;
 
   if constexpr ((kLanes >= 4 && !HWY_HAVE_SCALABLE) ||
-                (HWY_HAVE_SCALABLE && sizeof(T) == 4)) {
+                (HWY_HAVE_SCALABLE && sizeof(T) == 4 &&
+                 hn::detail::IsFull(d))) {
     // Coefficients for P(y/2) ~ index using CF algo
     const auto k0 = hn::Set(d, static_cast<T>(-0.1145426548151546));
     const auto k1 = hn::Set(d, static_cast<T>(3.4556654973457404));
@@ -118,23 +119,12 @@ HWY_INLINE hn::Vec<D> FastSigmoid(D d, hn::Vec<D> val) {
         static_cast<T>(1.1565092321921886), static_cast<T>(-0.7540678688218365),
         static_cast<T>(-3.767209600467866), static_cast<T>(-9.357047249878605)};
 
-    if constexpr (kLanes >= 8 && !HWY_HAVE_SCALABLE) {
-      auto idx = hn::IndicesFromVec(d, idx_i);
-      hn::CappedTag<T, 8> d8;
-      b = hn::TableLookupLanes(hn::ResizeBitCast(d, hn::Load(d8, arr_b)), idx);
-      c = hn::TableLookupLanes(hn::ResizeBitCast(d, hn::Load(d8, arr_c)), idx);
-      d_coef =
-          hn::TableLookupLanes(hn::ResizeBitCast(d, hn::Load(d8, arr_d)), idx);
-    } else {
-      auto idx = hn::IndicesFromVec(d, idx_i);
-      hn::FixedTag<T, 4> d4;
-      b = hn::TwoTablesLookupLanes(d, hn::Load(d4, arr_b),
-                                   hn::Load(d4, arr_b + 4), idx);
-      c = hn::TwoTablesLookupLanes(d, hn::Load(d4, arr_c),
-                                   hn::Load(d4, arr_c + 4), idx);
-      d_coef = hn::TwoTablesLookupLanes(d, hn::Load(d4, arr_d),
-                                        hn::Load(d4, arr_d + 4), idx);
-    }
+    // Since Lookup8 is available for HWY_MIN_BYTES / sizeof(T) >= 4, this
+    // condition covers all cases we encounter inside the top level if block
+    // inside FastSigmoid
+    b = hn::Lookup8(d, arr_b, idx_i);
+    c = hn::Lookup8(d, arr_c, idx_i);
+    d_coef = hn::Lookup8(d, arr_d, idx_i);
   } else {
     // --- FALLBACK PATH: Blend Chain ---
     // Thresholds for intervals