I think the 7 PRC sounds like a fun project on that platform. 26 Nosler is an interesting one, but I'm not keen on it either. 28 Nosler would probably be an easy swap too if you wanted all the horsepower a man could need. 😁
I have always gone with 10% unless there were "circumstances". If you're happy, the guide will usually be happy with that. What others have said, plan for that, adjust accordingly and with what you can afford. I plan for 10% in the budget and it usually comes out just right.
The LRX should be great. I've dropped 6 of them with NBT, TTSX, ETips and LRX. The only one that ran was the NBT, but it was a short distance and had a massive exit wound. The other were all DRT, 270 Win and 280 Rem; all at about 200 yards.
I'll echo a lot of what's been said already, chili, pulled pork, venison burgers (patties preformed and frozen), sausage from previous year's elk/deer/antelope. My secret weapon is having my wife make her Pad Thai and bag that. Simple reheat and enjoy with some fresh chopped cilantro and a pan...
Sounds you've got it figured; Always good to verify. Whenever I am up against the clock like that and stressing long distance, I draw a gimme shot. Good luck on the hunt and report back your findings and success.