Sending Data From Unity To Arduino

Hi! I am currently working on a project for a vr glove that is controlled with an arduino that communicates with Unity. I currently have a system set up that tests when the finger in unity collides with an object and sends the fingers angle to the arduino so that it can set the lock position (The angle that a servo limits your finger to so that you cannot bend past that angle.) to that angle. I have unity send the data into the serial monitor and a "C" in front of it in order for the arduino to distinguish it from other data. Here is my code for unity:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class arduinoCollision : MonoBehaviour
 {
 
     public arduinoMovement arduino;
 
     public float lockPos;
 
     private void OnTriggerEnter(Collider other)
     {
         if (other.tag == "Finger")
         {
             arduino.sp.WriteLine("C" + arduino.pos);
 
             Debug.Log("C" + arduino.pos);
         }
     }
 
     private void OnTriggerExit(Collider other)
     {
         if (other.tag == "Finger")
         {
             arduino.sp.WriteLine("C180");
         }
     }
 
 
 }

(I have the arduino and Unity link in script "arduinoMovement")

Arduino code:

 #include <Servo.h>
 
 int analogPin = 3;
 
 int lockPos = 90;
 
 Servo servo1;
 
 void setup()
 {
   Serial.begin(2000000);  
 }
 
 void loop()
 {
  
  int val = analogRead(analogPin); 
   int position = map(val, 105, 466, 0, 180); 
   Serial.println(position); 
     
     if(Serial.available() > 0)
     {
      String dataString = Serial.readString();
 
      if(dataString.startsWith("C"))
      {
       dataString.replace('C', '0');
 
       delay(30);
 
       lockPos = dataString.toInt();   
      }
 
     }
 
   if(position > lockPos)
   {
     servo1.attach(9);
   
     servo1.write(lockPos);
 
     delay(30);
     
     servo1.detach();
   }
 }

Currently the data does not transfer quick enough and seems to be very finicky with setting the lock Position. If you know how to fix this I would really appreciate some help. Thanks!