Im enjoying the 1st tiger doc.
Opel blitz - allows me to pump out fuel and in a 1v1 game it allows u to receive significantly more fuel than ur opponent.
Strafing run - it is amazing vs swarms of reds and really just renders the red infantry useless...I love using it when I make aggressive advances
Tiger is awesome in my opinion
And fragmentation bombs can be very usefull on enemy defensive blobs
I dnt use arty officer
Fragmentation bombs also insta-gib Katyushas. There is smoke, but the bombs come pretty quickly.
You should definitely try the Artillery Field Officer. It costs the same as a Grenadier squad (the squad consist of the officer + 3 grens) and has the same reinforce cost as a gren, and gets called on instantly. He's also got some very cool abilities: smoke, an active buff to offense for all nearby friendly units including allies, and Concentrated Barrage, which is basically the Brit Captain's Victor Target and which disregards barrage cooldown.