I agree @carolinamom2boys is one of the most knowledgeable parents I have spoke to - I would be interested to see her opinion. I can tell you the ACT is my concern. From my understanding it is heavily weighted. We had some other students from my D’s school get the lower OOS award with a 32 ACT-
As for honors - it is no understatement I think the system at Clemson is odd- My D got the highest OOS award- 5.28 GPA and not honors- It was a big reason we moved on.
Look back at acceptances and the info from other parents. I remember many with high GPA getting waitlist or bridge program. It is hard to predict.
My 2 cents- have him try one of the tests again- send it to no schools until you see it, that may alleviate some stress,I would also look at a really good prep program a few points can make a difference.
By all means, visit and apply- but try and get a balance of reach, match and safety schools- I would not consider Clemson a safety- I would not be reliant on the 15K and god knows I’m the wrong one to ask about the honors program.Good luck- try and enjoy the process.