the most adapted rendering technik for texture backing

[n6]

I use rendering to texture a lot but I always face this problem : when I render a simple still from my curent scene with some parameters it looks 100% ok but when I render the backed texture then problems come : very dark blochy things in some radom intersections, light leak etc...
And this happen even if I increase all the parameters a lot.

I use IR map + Lightcache so maybe is this the problem? Maybe the only way to get correct result when backing texture is to use QMC for first and secondary bounce?
But this technik is very very slow to render if you want a noise free baked texure.

So my question is : what is the most correct approch (rendering settings) when doing texture backing ?

[instinct]

If i remember right then setting up the secondary ray bias a little (VERY little, like 0.01 or 0.02) helps in render to texture problems.

Regards,
Thorsten

[n6]

yes yes I know that