I do not think so, dropping fuel to HQs now supplies the HQ itself and its attached SUs, but does not create stocks in it. Also note Axis airbases do not raise air drop efficiency anymore in 1941.
The game was played before I got serious with WitE but from reading changelogs the HQBU mechanics were not changed since then (according to morvael supply mechanics will be changed considerably for the next, not yet unpublished update). The rail modifier has been reduced (it is now harder for the Axis) and the HQ BU cost has been increased massively.
Also, I think there were some nerfs for fuel exploits since then, for example regarding use of recon aircraft to draw fuel into army HQs.
If you play a new game please make an AAR