how far do you sit from your speakers?

According to the Wilson Audio Set Up Procedure (WASP), the listening seat should be in the area of 1.2 times the distance between the two speakers. For instance, if the speakers (measured from each tweeter) are 10 feet away from each other, you should consider sitting 12 feet away from each speaker. I hope this helps.

Some speakers work for near field better than others.I only had them for short time but a pair of Audio physic Sparks were fun since they were narrow florstanders easy to pull up away from wall and then put back.Those "near field" sessions gave up some bass but added to sound stage depth and speaker itself lent itself to doing so easily.Other large speakers or even monitors aren't as easy to move around.But some speakers require different distance from wall which everyone knows but some speakers like studio monitors are designed to listened to up close.But Hartley's rule of thumbs is good starting point before you start moving them around to find optimal placement.Some speakers sound lousy and are difficult set up some aren't.A lot of speakers just snap into focus with small changes in placement.
Chazbo

I have soundlab m2's 3 feet off the back wall;10 feet apart and sit 12-13 feet in front of and right in the middle.My back wall is 10 feet behind me and side walls are 8 feet from the listening position.

If you are told one particular seating position is THE position for best sound or even particualrly good sound, will you repair to that scenario even if once done you aren't happy with it?

Theories aren't always applicable or even practical at times. Although there is an immense data base for optimizing sound via speaker placement and seating positions which indeed help out a lot, in the final analysis the main factor is you.

Good to optimum speaker placement addresses only a portion of the issues surrounding the audible presentation. room treatments address the rest. Seating position for 'your' sweet spot will then be pretty easy to determine.

I use a recliner now and my head doesn't rise above it completely, so I'm like sitting close to the back wall, yet I listen in the near field sitting right at or a bit less than the width of the speakers away from them.

As I lay back the chair, or keep it upright, the presentation alters. Noticeably. What's best then? About 2/3 to 3/4 of fully reclined... IMO. But not only am I moving slightly away from or closer towards, the speakers as I lay back the chair, I'm lowering my ears closer to the height of the tweeters as well.

In the end, for me, being able to have the flexibility of minimal vertical and inline movement to and away from the drivers works for me. the changes in the soundfield at any different position are noticeable and I enjoy previewing music from different perspectives with some ease.

I'm sure you'll pick well, your fav spot... but do try several to find out. I think it's kind of like picking out headphones. Find the right neighborhood, then the right street, knock on a few doors and you'll find the house that will suit you best. Good luck and do enjoy.
I've moved me and speakers about so much I had to replace the carpeting and use platforms under my speakers! Now I just move the chair... up & down.

What's ideal depends upon the specific room and the speaker make/model and can only be determined by expermentation. Jim Smith's book "Get Better Sound" has an excellent procedure for doing this.

The procedure explained in the book worked well for me. I was pleasently surprised by the result.