Let me preface this by saying that I ride some really tough trails. My horses go barefoot most of the time. But like you I use boots when I know I'm going to ride 2-3-4 days in a row with out any rest.
I have destroyed every buckle and most cables on the Epics that I have owned. So I have gotten rid of all the epics. I have broken both the up and down buckles. It just upsets me to ride 10 miles into the wilderness and find my buckles broke and I have to ride out barefoot.
I switched to Bares. Had much better luck with them. I don't find them any harder to put on. I do have a hard time keeping them on at a canter. When they come off, I usually tear the gaiter.
It just become so expensive to use boots. I was buying new gaiters, buckles and cables every ride.
We are trying some of the gloves this summer. I also tried some of the Vettec Sole Guard last fall and had good results with it. In fact I'll probably use the Sole Guard for any week long rides I do this summer.
There are LOTs of folks who use Epics and Bares and have no problems with them. I suspect they ride in arenas, on gravel roads and easy trails. But I ride in the wilderness and the horses have to step over blow down logs, around and between large rocks, cross creeks and beaver ponds etc. They always seem to catch and break the buckles on something. I've even broken the bungie on several BAREs. We have used cotter pins, we have wrapped the buckles with duct tape. And we still destroy buckles. I've never had a problem with the rubber part of the boot. It's always been the fastening system.
Here is what a set of EPICS looked like after 10 miles. Notice both buckles are broken.
And this is what the trail looked like. Lots of rocks
Lots of stream crossing with rocks. It's easy for the horses to get their boots wedged between rocks.
Some places the blow downs have been cleared, Some places we have to step over them. The horses bump the front of the boots as they try and lift their legs over the logs.
I wouldn't even try Boas in this type of riding.