Reddit mentions of Aquaskinz Finger Shield for Surf Fishing

I say stick with the ABF40. You don't need an extra 100 yards so might as well save yourself the extra bit of weight and bulk by using the smaller reel. I don't know if anyone can even cast 900' on a spinning reel, so you almost certainly don't need another 300' on top of that since you're not worried about monster fish running with your drag.

Your rod can handle 1oz-6oz weights, so I still say to stick with 30lb braid for weights that heavy. Even a small hiccup when casting a 6oz weight will snap 15lb line, and your bail snapping closed will break it like tissue paper. A bad cast still almost certainly break your 30lb line too, but at least you have a tiny chance to recover your gear.

Get enough line on your reel (but not too much or it will slip off and be massive headaches), tape up your finger or get a finger guard, and toss out your bait with a 5oz weight and you should be happy with your distance.