i havn't watched your replay but i just want to give a feew tips you may or may not know.
1. avoid the arty commander like the plague. its horrible.
2. generally you want 3-4 IS with double brens by late game all at 2 or 3 vet. 1 IS should have the arty call in the others with medical.
3. use the IS's arty base call in as an area denial not to kill, the thing is bad at killing still targets. That said if there is a large group of mortars, AT guns, mgs ect then its good to kill them or atleast force them to move. See a volk blob? call it down on them when about to retreat or stay and fight out behind the arty forcing them to retreat.
4. in late game use a churchhill to spong and a firefly behind it to kill tanks or use 2-3 comets to flank the tanks while something is distracting them.
5. if the enemy have 2 or more mortars dont even bother building a mortar pit because it will die. (maybe unless your the royal engineers commander)
6. early cromwells are god
7. if you call in salvage engineers use them. pathers get you about 50 fuel, stugs 40 ect as well as man power and munitions
8. consider building a munition cach or fuel, or both
