Very short speaker cable length recommended?

Even with interconnects it seems Half meter might be worse sounding than 1 meter standard in some scenarios as well

It has to do with the electrical properties of the cable at the specific length as it couples with/influences (i.e. enters the circuit) the stability and the impedance of the source loading (output stage) and the impedance and type of input of the load.
See Sean's recent post in "diy interconnects review".

>>Go 6.5 ft or longer(2.0m)speaker, its the more optimal range overall in most cases it seems<<

There is no empirical data to support this and any knowledgable cable designer/manufacturer will always recommend shorter paths when possible.

Actually from my understanding if you go too Short then the tweeter and midrange can become more forward or even brighter in many cases(and I have experienced this), as the longer lengths keep the speed down a little bit helping for whatever reason the impeadance or what have you a better stable point to work in or something.. Now I have actually seen manufactures go to the extent to actually LEngthen considerable longer than needed Tweeter leads and things inside the cabinet even in order to somewhat time Align the drivers to not be to forward to the Bass drive... Sure Bass will probably never suffer from super short Current capable cables, but I could see how a speaker can be a bit un-balanced if you have super thick same shot length feeding the upper part of the crossover, maybe it will have Zero effect, try it, thats the name of the game.

There is no empirical data to support this

I tried very short cables and it was bright and irritating.
I tried longer cables of the same type and it sounded very good.
I tried various other short wires with the same effect, bright and irritating.
I put the long cable back in and it sounded fine.
I did this for several friends and they all confirmed what I heard.

How emperical do you have to get to confirm the effect? Have you tried it yourself or just assuming?

I contacted Kimber (a reputable manufacturer) about this and they confirmed that if too short their cables would not sound good.

Undertow, you understand incorrectly. I've spoken at length (no pun intended) with 3 major manufacturers about this as many of my customers have similiar concerns. All 3 unequivocally prefer the shortest length that is practical for the system. I tend to believe folks who engineer/design and build the products. One of them in fact is the manufacturer of the speakers you own. I suggest you contact Sean if you have any doubts. Good luck.