DoTween sequence query

using UnityEngine;
using DG.Tweening;
using RootMotion.FinalIK;

namespace jdp{
public class LookAtIKTweenTest : MonoBehaviour
{
    [SerializeField] LookAtIK m_lookAtIK;

    [SerializeField] float defaultWeight = 0.68f;
    [SerializeField] float defaultFadeTime = 1f;

    Sequence cacheStareSequence;

    void Start(){
        cacheStareSequence = DOTween.Sequence();
            cacheStareSequence.Pause();
            cacheStareSequence.Append(DoFadeWeight(1f, defaultFadeTime))
                                .AppendInterval(1f)
                                .Append(DoFadeWeight(defaultWeight, defaultFadeTime));
    }

    public void StareNotWorking(){
        cacheStareSequence.Restart();
    }

    public void StareNotWorkingEither(){

        Sequence stareSequence = DOTween.Sequence();
        stareSequence.Pause();
        stareSequence.Append(DoFadeWeight(1f, defaultFadeTime))
                        .AppendInterval(1f)
                        .Append(DoFadeWeight(defaultWeight, defaultFadeTime));
        stareSequence.Play();

    }

//Working but hacky
    public void StareWorking(){

        DoFadeWeight(1f, defaultFadeTime).OnComplete(() => {
            Invoke("TurnOnLookIK", 0.75f);
        });

    }

    public void TurnOnLookIK(){
         DoFadeWeight(defaultWeight, defaultFadeTime);
    }


    private Tween DoFadeWeight(float finalValue, float duration) {
        Tween tween = null;

            float val = m_lookAtIK.solver.GetIKPositionWeight(); // get initial value
            Debug.Log("val: " + val);
            tween = DOTween.To (() => val, x => val = x, finalValue, duration).OnUpdate (() => {
                m_lookAtIK.solver.SetLookAtWeight(val);
            });

        return tween;
    }
    }
}