I don't and have never had Trojans, mine are C&D "forklift" batteries. I have had three sets of batteries, these are the only ones I bought new. I sized them for no more than 20% discharge, because back then I read that somewhere, the less discharge, longer the life. I was pretty ignorant of batteries, but I went with that.
Twenty years later, I am still using them. During that time, there was a spell of about a year during which I was unable to fully charge them...problems with my array and some other issues. Five years ago, I fixed the problems and added to the array. The batteries were, no doubt, damaged by that problem. They are going to need replacement before too long. Had I known what I was doing back then, and not damaged them, perhaps I'd be getting 25 yr. from them.
When I bought them, C&D told me to expect 6 to 8 years use. So, I am two and a half times that.
So, this is an unscientific report, but in my case, it would appear that sizing for small-percentage discharge is quite beneficial to battery life. I would think that Trojans would benefit likewise.