The times given in the recipe are for relatively even 1-inch thick steak tips. When grilling, bear in mind that even those who prefer rare steak, prefer medium-rare steak tips because the texture is firmer and not so chewy. Serve with orange wedges.
Combine the soy sauce, oils, garlic, ginger, sugar, zest, red pepper, and scallion in a small bowl.
PREPARING THE STEAK TIPS:
Combine the marinade and meat in gallon-size zipper-lock bag; press out as much air as possible and seal bag. Refrigerate 1 hour, flipping bag after 30 minutes to ensure that meat marinates evenly.
About halfway through marinating time, turn burners on grill to high, close lid, and heat grill until hot, about 15 minutes.
Remove steak tips from marinade and pat dry with paper towels. Grill, covered, until well seared and dark brown on first side, about 4 minutes. Using tongs, flip steak and grill until second side is well seared and thickest part of meat is slightly less done than desired, 4-5 minutes for medium-rare (about 130 degrees on instant-read thermometer) 6-8 minutes for medium (about 135 degrees); if exterior of meat if browned but steak is not yet cooked through, move steak to cooler side of grill and continue to desired doneness.
Transfer steaks to cutting board; tent loosely with foil and let rest for 5 minutes. Slice steak very thinly on the bias. Serve immediately with orange wedges.