Irregular cruising power?
 

its getting warmer and hotter, I've been having some irregular curising speed. The power seems to go on and off while the peddle is held constant.

Since my Greddy BOV (VTA) is placed right behind the Main Fan, would it be a cause that the hot air blowing from the FAN is softening the spring tension in the BOV? making it float and lose the seal?

I don't think that your bov would lose its seal due to the fan blowing on it.

Do you have A/C? I had similar symptoms cause by the A/C compressor turning on and off rapidly due to it being overcharged.

even with A/C off?

What do datalogs show?
The temp of the air coming through the radiators is like 60-70°C; stuff underhood near the exhaust manifold gets much hotter. I doubt the Greddy BOV is that lame.

What's the wideband say?

LC-1 is still sitting under the center console! Until Begi could ship me their fixed DP, I won't be able to install the WB! >.< I has been 6 months already!