Ah ah BB i know it would be like that... I just was sure you know about that...
that why we doing that this way... you see regarding to the UV on the sphere and the seams... I mapped the sphere that would accept a mirrored panoramas from the mirror balls that user are going to do, make this job more simple for them all ... just click transfer and work is done...I did my job correct telling you all the time you use wrong maps for your sphere and you don't wanna listen to me..
I told you simple is beautiful and sometimes a simple way based on the real world and rules is working faster and better so why make it all so complicated..

make a picture of a mirror ball > convert to L/L sphere map in HDR SHOP > and after that convert to Light Probe, load into poser and render your scene with all right directions and light withut even to open photoshop... so simple is that so hard to understand ?

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"Surrender to what it is - Let go of what was - Have faith in what will be "