diff --git a/resources/definitions/hms434.def.json b/resources/definitions/hms434.def.json
index b2dbce3f13..5d4243e333 100644
--- a/resources/definitions/hms434.def.json
+++ b/resources/definitions/hms434.def.json
@@ -81,18 +81,19 @@
         "layer_height":                 {"maximum_value": "(0.8 * min(extruderValues('machine_nozzle_size')))" },
         "layer_height_0":               {"maximum_value": "(0.8 * min(extruderValues('machine_nozzle_size')))" },
         "line_width":                      {"value": "(machine_nozzle_size + 0.2)" },
-        "wall_line_width_0":               {"value": "(machine_nozzle_size - 0.05)" },
+        "wall_line_width_0":               {"value": "(machine_nozzle_size)" },
         "infill_line_width":               {"value": "(line_width)" },
         "initial_layer_line_width_factor": {"value": 110 },
 
         "wall_thickness":            {"value": "(line_width * 3) if infill_sparse_density < 95 else line_width" },
-        "roofing_layer_count":       {"value": "4" },
-        "top_bottom_thickness":      {"value": "(layer_height_0 + (layer_height * 3))" },
-        "top_layers":                {"value": "4" },
+        "roofing_layer_count":       {"value": "1" },
+        "top_bottom_thickness":      {"value": "(layer_height_0 + (layer_height * (top_layers - 1)))" },
+        "top_layers":                {"value": "4 if infill_sparse_density < 95 else 1" },
         "bottom_layers":             {"value": "(top_layers)" },
         "wall_0_inset":              {"value": "0" },
         "outer_inset_first":         {"value": true },
         "alternate_extra_perimeter": {"value": false },
+        "travel_compensate_overlapping_walls_enabled": {"value": false },
         "filter_out_tiny_gaps":      {"value": true },
         "fill_outline_gaps":         {"value": true },
         "z_seam_type":               {"value": "'shortest'"},
@@ -107,7 +108,7 @@
  
         "infill_sparse_density": {"value": 30},
         "infill_pattern":        {"value": "'lines'"},
-        "infill_before_walls":   {"value": false},
+        "infill_before_walls":   {"value": true},
 
         "material_print_temperature_layer_0": {"value": "material_print_temperature"},
         "material_initial_print_temperature": {"value": "material_print_temperature",
@@ -116,7 +117,7 @@
         "material_bed_temperature_layer_0":   {"value": "material_bed_temperature"},
         "material_flow_layer_0":              {"value": "material_flow"},
         "retraction_enable":                  {"value": true },
-        "retract_at_layer_change":            {"value": true },
+        "retract_at_layer_change":            {"value": false },
         "retraction_min_travel":              {"value": "(round(line_width * 10))"},
         "switch_extruder_retraction_speeds":  {"value": "(retraction_speed)"},
         "switch_extruder_prime_speed":        {"value": "(retraction_prime_speed)"},