Usually you have to make swaps in gear/talents for good speed farm potential. The bash build I listed as well as the mat build that was just written would pull an RG in a minute for a good rift or so, 4 for a bad rift. Multi level/empty. I've had T6 RG up in 40s, which isn't awful for a crusader considering I'm used to 30s-70s on my dh/barb. Fastest pull was in a graveyard, 40s with a conduit pylon, and every last mob was dust eater. I'll never see that again, which is why I say 70s is more realistic and that's in an optimal rift. Sub optimal max time is 4-5 minutes, depending on number of levels and mobs.
I've used a condemn and FoTH build for clears and I've tried several different rolands setups, it is really hard to match the double mobility of steed charge and bash. Not wanting to swap gears is holding you back bro, my dh/barb with gr setup lose around 1:30 on a t6 time with decent density. Swap to a speed farm build and RG's are up in a minute or less.
If you don't want to swap around etc. that's a personal preference, if you like the foth skill that again is a personal preference, however you're slowing yourself down. That being said I can appreciate the fact you enjoy FoTH setups, I spent the first 5 months I played Cruz ripping up T6 with that skill and firestarter/darklight before the nerf that is. Fissure is fun to play with as well, you can get the whole screen to be an electric chair for mobs.