I think giving it a higher accuracy shot for a premium muni cost (even 150) is perfectly fair considering there are now uncounterable commander abilities that are near perfect accuracy (time on target artillery; stuka dive bomb).
This one would require not only a hefty muni cost, but also having the howitzer built in the first place, vetted, and also limited by its own range.
edit: also, switch the ml-20 in tankhunters tactics with b4 as well ;]
+1