How can I fix Raycasting FindPartOnRay Delays? (Please help!)

So, I am trying to create an attack where a user lauches a projectile forward, and the projectile should stop/break whenever it comes in contact with anther brick. For this, I have been utilizing raycasting (as the projectile "moves" via changing its CFrame).

For whatever reason, the part of my code that detects obstacles only seems to work well with small obstacles (like short, thin walls) rather than what most of my game is built with (larger, thicker blocks of earth). Is there a reason for this? It seems like a runtime error more than a logic error, but I'm open to suggestions (as I'm fairly new to this).

Here is the part of my code that detects obstacles. You can ignore most of the lines that don't pertain to actual raycasting.

    for i = 0, 75, 1 do -- Moves the projectile forward.
        wait()
        if sensor.Name ~= 'DeadTornadoToss_' .. player.Name then
            tornado:SetPrimaryPartCFrame(tornado:GetPrimaryPartCFrame() - tornado:GetPrimaryPartCFrame().LookVector * 1.5)
            ray = Ray.new(sensor.CFrame.p - sensor.CFrame.LookVector * 5, sensor.CFrame.LookVector) -- origin, direction
            ray2 = Ray.new(sensor.CFrame.p - sensor.CFrame.LookVector * 5 + sensor.CFrame.RightVector * 3, sensor.CFrame.LookVector) -- origin, direction
            ray3 = Ray.new(sensor.CFrame.p - sensor.CFrame.LookVector * 5 - sensor.CFrame.RightVector * 3, sensor.CFrame.LookVector) -- origin, direction
        end
        local part, hitPosition = workspace:FindPartOnRay(ray)
        local part2, hitPosition2 = workspace:FindPartOnRay(ray2)
        local part3, hitPosition3 = workspace:FindPartOnRay(ray3)
        if part or part2 or part3 then
            if part then
                obstacle = part:FindFirstAncestorOfClass("Model")
            else if part2 then
                obstacle = part2:FindFirstAncestorOfClass("Model")
            else if part3 then
                obstacle = part3:FindFirstAncestorOfClass("Model")
            end
            end
            end
            if obstacle ~= nil then
                if obstacle:FindFirstChild("Humanoid") == nil then
                    print("Hit part")
                    sensor.Name = 'DeadTornadoToss_' .. player.Name
                    tornado.SmallTornado.Transparency = 1
                    break
                end
            else
                print("Hit part")
                sensor.Name = 'DeadTornadoToss_' .. player.Name
                tornado.SmallTornado.Transparency = 1
                break   
            end
        end
    end