I remember back in the day for Langar they were giving pizza and coke near mine lol
Without seeing a video I can't be exact about why I think the lockout portion of your wide grip bench is harder but there is a few things I would say:
In Raw Bench typically the hardest part is at the bottom of the lift unlike in equipped. It will vary from person to person but typically either on the chest or just a few inches off the chest. The wide grip bench is meant to be harder near the bottom according to the general strength curve compared to a closer grip bench but don't forget you can recruit more of your pecs with a wide-grip set up, but the strength curve is a more over-powering factor. A lot of beginners can actually close grip more but thats just because they have developed their arms/triceps more than their chest and shoulders.
I think it's good your doing wide grip as honestly I think it's safer for the shoulders contrary to the stuff out there in the fitness community. Now what I think is happening is two things:
1) Getting the bar off your chest is actually the hardest part of your lift but by the time it comes to your lockout your weak because of the force exerted at the bottom - people think that because they are missing out lockout that they need to do board presses etc. but actually even with all that it's the strength off the chest thats the limiting factor.
2) Your new to wide-grip (mine is index on ring but your can still cover the ring and go wider with a japanese grip) bench and it's likely that your biomechanics of the lift is causing the lockout portion to be difficult. A lot of 'tucking in the elbows' on a wide-grip bench isn't the way to go - it is likely your probably 'over tucking' having come from a closer grip set up. Again a video would be conclusive but I suspect this is the issue. On the concentric when you over tuck unless your using a sink style bench with leg drive which I don't think you do, along the fact your probably not arching enough - I suspect your elbows haven't got more 'untucking to do' at the lockout as your doing what you can to get off your chest subconsciously. I would say next bench session think more about the timing of your 'untucking' if your not going to play with arch etc..
If it's 1) just continue what you're doing and your pecs will get stronger under heavier load. 2 is what I think it is more likely to be, in that case this is a technical thing you just gotta work on for next session when you warm-up. Hope my advice helps.