Bench Press: Limiting Factors?

[Grape Ape]

I've always had a very low bench and small chest. I've been mostly lifting 5,3,1 for the last 6 months, with all my assisted lifts in the 8-12 window. I've recently switched my routine to accommodate even heavier weight, but my bench numbers will not go up(let alone my chest growing). Incidentally my squat numbers keep climbing weekly. Here's my current chest routine:

W/G Flat BB Bench: 6, 1, 6
Incline DB Bench: 3, 3, 3 +30 second fascia stretches
Weighted dips: 3, 3, 3
Pec Deck: 1 rest/pause set starting with 8 reps and going for 3 sets with 15 second rest.

Chest is paired with legs once a week on Monday. I feel my limiting factor may be tricep strength, but as I've said I have a tiny chest so it may be that. Thought about maybe benching twice a week now, or switching to a closer grip. Wondering also, if my heavy squats are exhausting me too much.

Any Tips?