By Luc Olinga The EV maker continues to demand one of the highest down-payments for its Semi even as production of this truck has been pushed back yet again. You don’t change a formula that wins, says an adage. In this case, the formula is doubly winning. The electric vehicle (EV) manufacturer Tesla (TSLA) – Get Tesla Inc Report continues to rack up orders and reservations for its Semi, a prototype-stage electric class-8 truck, despite the fact that production and deliveries have been postponed once again. Elon Musk, CEO of the Austin, Texas-based group, said on a fourth-quarter earnings confe…