DE heretic is fine for an a/m though i'd prefer trying to run it more as a tanky attacker that ops.

As for "what works" your going to have to find a niche roll in your kd because a/t/m is what your going to be tempted to run. if u do it "right" u can be "okay" at it, if u do it poorly u'll be a drain.

My plan would be to nm off easy people then ns them followed by a single hit for land. Have the rest of your kd follow and chain. Your own plan is to use "slow growth" to build up some econ then as your econ grows you train offspecs. You'll either start gaining more and more land and "hopefully" snowball into unbrekable hitting OR u can stall your growth once u have okay econ and decent offense to start massacring the enemy to help your kd.

For what its worth the De heretic in my kd last age END of age had 100% success nming normal attackers but ended the age at ..25.585 (Dark Elf) mod wpa....(on a raw of 7.174). Like all things though end of ages numbers are much higher than early age targets...i think he aimed for 4-7 wpa and 4 tpa all age.