Having problems with my breakout game in python. The ball speeds up when I change it's x_move, the ball and paddle mysteriously speed up as more tiles are broken, and my tile collision isn't working smoothly.

I've tried all sorts of things like onscreentimer but I just can't quite get it.

from tkinter import *
from turtle import Screen
import time
from paddle import Paddle
from tile import Tile
from ball import Ball

screen = Screen()
screen.setup(width=1000, height=600)
screen.bgcolor("black")
screen.tracer(0)
screen.title("Breakout Game")

paddle_position = (0, -250)
paddle = Paddle(paddle_position)

x_values = [-400, -200, 0, 200, 400]
y_values = [250, 225, 200, 175, 150, 125, 100]
color = ["red", "orange", "yellow", "green", "blue", "purple", "teal"]
brick_list = []
for x in x_values:
    for y in y_values:
        color_choice = color[y_values.index(y)]
        tile_position = (x, y)
        tile = Tile(tile_position, color_choice)
        brick_list.append(tile)

ball = Ball()

left_keys = ["a", "A", "Left"]
right_keys = ["d", "D", "Right"]

screen.listen()
for key in left_keys:
    screen.onkeypress(paddle.go_left_start, key)
    screen.onkeyrelease(paddle.go_left_end, key)
for key in right_keys:
    screen.onkeypress(paddle.go_right_start, key)
    screen.onkeyrelease(paddle.go_right_end, key)


# tile_set = 0
game_is_on = True

def breakout():
    game_is_on = True
    global tile_set
    global brick_set
    ball.move()
    if paddle.move_left:
        if paddle.xcor() - 100 > -500:
            x = paddle.xcor()
            x -= 2
            paddle.setx(x)
    if paddle.move_right:
        if paddle.xcor()   100 < 500:
            x = paddle.xcor()
            x  = 2
            paddle.setx(x)
    if ball.xcor() > 480 or ball.xcor() < -480:
        ball.bounce_x()
    for item in brick_list:
        brick_set = 1
        if item.ycor() - 20 <= ball.ycor() <= item.ycor()   20 and item.xcor() - 100 <= ball.xcor() <= item.xcor()   100 and brick_set == 1:
            ball.bounce_y()
            item.hideturtle()
            brick_list.remove(item)
            tile_set = 1
            brick_set = 0
            # print(tile_set)
    if paddle.xcor() - 110 <= ball.xcor() <= paddle.xcor()   110 and ball.ycor() == -230 and tile_set == 1:
        # print(ball.xcor() - paddle.xcor())
        value = ball.xcor() - paddle.xcor()
        ball.bounce_paddle(value)
        tile_set = 0
    if ball.ycor() > 280:
        tile_set = 1
        ball.bounce_y()
    if ball.ycor() == -300:
        game_is_on = False
    screen.update()



while game_is_on:
    breakout()

heres my ball class

from turtle import Turtle

class Ball(Turtle):

    def __init__(self):
        super().__init__()
        self.shape("circle")
        self.color("red")
        # self.fillcolor("orange")
        self.penup()
        self.goto(0, -200)
        self.x_move = 1
        self.y_move = 1
        # self.move_speed = 1.1

    def move(self):
        new_x = self.xcor()   self.x_move
        new_y = self.ycor()   self.y_move
        self.goto(new_x, new_y)

    def bounce_y(self):
        self.y_move *= -1

    def bounce_paddle(self, value):
        movement = value * 0.01
        self.y_move *= -1
        self.x_move = movement

here's paddle:

from turtle import Turtle

class Paddle(Turtle):

    def __init__(self, position):
        super().__init__()
        self.shape("square")
        self.color("gray")
        self.right(90)
        self.shapesize(stretch_wid=10, stretch_len=1)
        self.penup()
        self.goto(position)
        self.move_left = False
        self.move_right = False
        self.move_speed = 1.1

    def go_left_start(self):
        self.move_left = True

    def go_left_end(self):
        self.move_left = False

    def go_right_start(self):
        self.move_right = True

    def go_right_end(self):
        self.move_right = False