I decided it would be better to abandon my tragic TL and help yours. Because you have a mass of similar ideas. So a few ideas on where I was going to be based on:
Verdun:
-Attack on both sides of the Meuse, the western region of the front would hit quite small forces the day after the start of the main attack.
-When planning the date of transfer from 11 to 21 February, so change in the weather is not surprising the Germans during the artillery fire, and they can surprise their attack French: German losses less, even greater losses in the first days of the French.
- March 8-9 Rotamaster von Scheele recording in a report during the attack on Fort Vaux that came to it, but he had not conquered the fort. Germans did not lose momentum on the senseless, savage attacks on the fort, to get it ASAP, because thet gave to the public that it was taken when it wasn't.
- Accidental discovery by a German plane / blimp of "Sacred Road", the shift Zeppelin belonging to the Army from the attacks on England to Verdun, one, or more during the campaign bombing of the sacred road, perhaps by gas projectiles (from the airship).
-In the later part of the campaign, the main direction of impact: the more Montzeville and Coil de Froide Terre ", to move closer to the city
Somma: retreat into deeper positions, rather than keepeng and the old ones and stoping the British deep in salient.
Tanks: 2 British tanks captured by the Germans in 15 September in a driving abilities. Later: instead A7V: more armored artillery tractor. Minimum size "box", open at the top based on the chassis A7V: In theory, the transport of guns and ammunition directly to the first line. Use them at Cambrai in 1917, with field armament: MG, mortars, light guns mounted on a solid front. Based on the experience of Cambrai: during the spring offensive of 1918 appears larger number of tanks: something like the LK with 57 mm cannon, perhaps in the turret, and maybe even something a la Kanobil, or "WW I Stugs". (I always imagined Kanobils as something like "WW I Stugs")
I also have some interesting ideas on ending the war: a ceasefire, the revolution in Germany, Versailles and eastern Europe, so if you want: PM