I wouldn't really do ab work with heavy weight/low reps, especially for a short term aesthetic goal. That type of training is geared towards strength building, and is better suited for compound lifts (squat, bench, deadlift). That said, for the long term I've found powerlifting and focusing on strength helps people build a solid foundation of muscle mass, and makes it easier to see your abs, even at higher body fat percentages.
But ff you have 10 weeks to get shredded before your girlfriend comes home, I would focus primarily on MRT workouts and density training, while adding things like rope crunches a few days a week for 3 or 4 sets of 8 to 12 reps (to get your abs to really pop). You need to drop your body fat % to at least 12% (most people with less muscle mass will need to be less than 10%).
At the same time, you need to be in a caloric deficit. Mutliply your bodyweight by 10 to 13 - this is your calorie range. Split your week into about 4 low calorie days, and 3 high calorie days. The high calorie days should fall on your hardest training days.