The Strumtiger is just a B4 version of the Priest, a Howie on wheels. You don't see the Priest shells coming until they hit and it can fire from across the map; where as the Sturmtiger must get within every kind of AT range. Plus the shell only does massive damage to clumped stuff, like in that video that was floating around of it killing 3 Jacksons in one shot, well the Jacksons were freaking tread to tread.
Maybe you can change this unit to be like the Priest with map long range, but lower its armor and give it more scatter? The shell sound would give people time to react and the angle would allow it to fire over most shot blockers.
