Always do what client wants. Even if you are doing free like now, he still is technically your client.
And considering lows, I just placed ReaEQ with High pass on subs, and brought down ~350-360Hz (something like that, I don't remember) a fair amount. Than took ReaXComp and compressed first band which i made go 0-150Hz or so with some medium attack time (probably was 10-15ms or so), and gave it some gain to make up. That makes the punch. Than I just compressed second band which countains boxy freqs without any gain makeup because it was still too boxy at times even with that cut I made in reaEQ.
You can do it a lot easier probably by just applying few low shelves and high passes on individual tracks
