Very good passes this time of year. I don't even know how you can be out there in the middle of the day. I feel nearly heat exhausted working in the garage.
I see no reason to not go with the 4.0 or 3.88, I'm running the 4.13 on a stock longblock. Your built motor breathes better which is likely why you havent seen a boost increase.
I work for Costco. We require masks to be worn. If you state you have a medical reason precluding you from wearing a mask we will not require you to do so, but we absolutely have the right to ask you to leave.
Most of the tests you see are of a ported 18 vs a stock Boss. The Boss needs to be ported as the stock runners have a smaller cross section than the '18 or a CJ. I picked up 1.5mph by porting my Boss.