Hey, Adam. Nice to meet you. Putting on weight or building strength has to do with the kitchen more than the routine. You started at 118 and got to 129that's a good start. Do more of that. You say your gut got bigger as you got stronger, but I'd say more than that happened as your gut doesn't technically lift anything, so if you got stronger as your post suggests, your muscles did too.
That said, I would gain on that routine you posted. It's fine. Covers all the bases in general. If you are not gaining, you are not eating properly.
So, what is your diet? If routine and commitment are fine, then diet becomes king. Indeed if it is not king already.
I am Anton Zdravko Martin!
Best meet lifts: Sq 150 Kg (330 lb), Bench 120 Kg (264), DL 160 (352) @89 Kg (197)
Best gym lifts: Sq 375, Bench 280 (pause), DL 385 @205 or less
Goals: 3/4/5 while healthy and fit
"Hack away at anything which isn't essential. Do what you love, and do it often." Fazc.
"Everything competes for recovery so more assistance is not always the best idea." miked96
"Squat:15 sets of 3 with 150Kg
Deadlift:15 sets of 3 with 150Kg
It's not rocket science." Big Swede