Beginner tongue-blocking questions

Hi David. I've just recently started the lessons and I have a tongue-block technique question, as I know from other instruments the damage you can do with bad technique

20-second background ass it's not my first foray into trying to learn the harmonica:

I'm primarily a guitar player, and years ago I first picked upa harmonica as a guitar accompaniment with a neck brace - Heart of Gold, Piano Man - all the usuals. Because of reading about tongue-blocking on the internet I play like that, but I know know I was blocking from the wrong side - without the tongue blocking anything I would be playing notes higher on the register, rather than lower

After taking a greater interest in harmonica-playing and blues in general, I used some of Adam Gussow's lessons, and he preached puckering rather than tongue-blocking. I regret taking that route now, as I found that the lack of clear progressions route to the lessons stoppped me from getting better, and I am now back to start, having to learn to tongue-block again. I can bend and overblow (to an extent) with a pucker, but it is no use to me in a practical or musical sense

Anyway, I've been working just on blocking correctly for the past few weeks, moving between 4, 5 and 6, and it's getting there. Going up from 4 to 6 was easy, but I struggled with moving back down as my tongue would move with the harmonica 

So there are 3 ways that I have managed to not have my tongue move with the harmonica, but I don't know which I should focus on:

• Less tongue pressure on the harmonica
• Anchor tongue to back of bottom lip
• Anchor tongue to back of bottom teeth

The main reason I am asking is that I have found it easiest with my tongue anchored to my bottom teeth, but given that teeth are an immovable surface I'm concerned that it may cause me issues down the road when it comes to shaping and bending notes.

Can you advise the best of those 3 approaches please?

Thanks in advance for your help