I received my 364 the other day. This is my first Large CF tripod after shooting off of aluminum ones for a while.
Which half ball, or leveling base are you guys using. Mine came with the flat base and the bowl.
I have the RRS TA-3 in mine, but I'm using the bowl that came with the tripod. If you use the bowl that comes installed on the TA-3, it won't latch on the lock mechanism; you'll only have the clamping action to secure it. Good way to lose a $300 item IMO.
Now, RRS advertises the TA-3 as having 15 degrees adjustment in all directions; that would for all intents and purposes, mean, a range of motion of 30 degrees up/down. Using my phone to read cant, I tested the TA-3 in both the RRS bowl and the Leofoto Bowl, both without a rifle clamped in (in other words, phone directly on the clamp), and with my AXMC clamped in (phone on rifle). Readings were essentially the same with both methods. I found that my phone read a total range of motion for the RRS bowl at 27 degrees- three less than advertised. The Leofoto bowl with the TA-3 gave me 23 degrees total ROM.
This ROM reduction is caused by two main differences in the bowl designs; first, the center hole on the leofoto bowl is a smaller diameter than the RRS, so the threaded stud that has to go through it and pivot around, is inhibited by the smaller hole. This issue could be resolved by opening up the leofoto bowl's center hole. HOWEVER, that's not the end of it... The design of the leofoto bowl, with a deeper skirt; along with the contoured mating surface of the screw "clamp" that locks down the leveling base's movement, essentially squashes any hopes of getting equal ROM after swaping bowls. There is no good way to open up the skirting on the leofoto bowl, or you'll simply lose it, and with it, the grove which the retention lock interfaces with. The contoured piece that locks down on the bowl (sort of like a super thick, rounded washer) could be reduced in diameter, since it would otherwise hit the skirt, but I don't know what the cost would be in terms of lock-up... Reducing the surface area for friction to take it's hold could be a problem.
So, with that said, I'd likely suggest looking at the RRS TA-U-LC. This base appears to be nearly identical to the TA-2, except it's designed to mount on a 3/8 stud, which your tripod came with. Up-shot to this leveling base, is the 35lb weight rating vs the 25lb weight rating on the TA-3. You lose the under mount tension knob, but the collared style may be better under some conditions anyway, as it's larger, and right there in the open, directly below the rifle.
The other piece of this puzzle I suggest looking into, is their newly introduced Anvil-30 ball head. I haven't been able to find a lick of info out there on this yet, but they claim it's been designed specifically for shooting, with all the most shooting-useful features of leveling bases and ball heads, with none of the disadvantages for shooting that come with each. That is essentially, the only thing out there info wise. Point being, might be worth looking into when more info becomes available.