I remember rotating between DFHT and the 5x5 way back when. They do work decent together, but you need to keep in mind that you're going from one extreme to another. My train of thought was always increasing strength.. Which will pay dividends for mass as I go along. A stronger me will be a bigger me.
There was a point when I was at my limit for the 5x5. THAT is the time when you need to work the assistance exercises a bit, change things up, figure out what's stopping you and work to fix it. THAT is where (for myself) the DFHT came in. Now instead of just doing the lifts themselves, I'm doing floor and board presses, powerlifting specific accessory exercises (rolling db extensions, tate presses, ect) which helped strengthen my weaknesses preventing me from progressing.
You stated you haven't plateau'd on anything yet.. Good for you! Keep going and squeeze what you can out of it. If you're bored, like I said, throw in a couple of different things to make it interesting again. Toss in box squats once a week, or some cleans for them traps/shoulders. If you're REALLY bored lol, just take a week or two and just play it by ear. Don't make up some ellaborate plan, just walk into the gym and satisfy all those cravings you have albiet high rep ranges, new exercises, new machines, ect.
Eventually, if you want results bad enough, you'll make your way back to what has worked the best. That's what I've done. I'm at the point where I've paid my dues with these programs and can globalize lol. I've been doing all types of routines over the past few years, stayed consistant with every one, and found that DC was the best fit for me. Do I get bored with it? Not really bored, just mentally drained trying to beat my logbook. Will I deviate from it? Nope, but that's what deloading is for.
Maybe you'll come back with a few ideas on how to make the program a little more enjoyable. Shit, you could just be a guy who thinks to himself, "I'm a regular guy, lifting's just a hobby, and I want to go have some fun 3-4 times a week like everyone else!"
^ And I'd envy you for it because I feel like a fucking slave sometimes with the shit I put myself through!
