update config.json

openlane/tiny_user_project/config.json

diff --git a/openlane/tiny_user_project/config.json b/openlane/tiny_user_project/config.json
index 6c8d082..c498546 100644
--- a/openlane/tiny_user_project/config.json
+++ b/openlane/tiny_user_project/config.json
@@ -11,9 +11,10 @@
     "CLOCK_PORT": "io_in[0]",
     "CLOCK_NET": "io_in[0]",
     "DIE_AREA": "0 0 500 500",
-    "FP_PIN_ORDER_CFG": "dir::pin_order.cfg",    
+    "FP_PIN_ORDER_CFG": "dir::pin_order.cfg",
+    "FP_CORE_UTIL": 55,
     "PL_BASIC_PLACEMENT": 1,
-    "PL_TARGET_DENSITY": 0.5,
+    "PL_TARGET_DENSITY": 0.6,
     "SYNTH_READ_BLACKBOX_LIB": 1,
     "SYNTH_USE_PG_PINS_DEFINES": "USE_POWER_PINS",
     "SYNTH_STRATEGY": "AREA 0",