You are a lot stronger than me by max's...
But I'm like this | | far from actually being able to go into a mass phase for the first time in 2 years...
Last time round I got 20lbs in a 6month phase making most of those gains in the last 10 weeks.
Since then I've only got 20lbs in 2 years which really sucks but life sometimes takes charge.
I'm not saying this is something you're not considering but if you aren't... Maybe it would be worth considering, as I am, doing considerably more volume on certain bodyparts and more frequency on others and for some leaving both volume and frequency pretty moderate.
Back - high volume, moderate/average frequency e.g. 1-2x week.
For reason above I'm putting chest with triceps also I like the idea of my triceps getting fatigued by bench press, this may be a negative for some but I don't think pre-fatigue is a bad thing on a mass/hypertrophy phase. Chest in my opinion should have more frequency than back with slightly less volume and as triceps are technically 'arms' it also makes sense to pair them together so they get more frequency.
Biceps get their own day in my plan I usually stick them in with back though.
Anyway I hope your mass phase goes as planned.