from what i've heard, the dunlops weren't really built for cutting through high gain. i think the dimebag wah was built specifically for that. the morley bad horsies and the tremonti also.
i put mine in front, before the compression and dist. oo nga, mejo less pronounced yung wah pero it's definitely more usable because the levels are even.
have you tried in front, pero naka-off yung comp?