Tin sizes and the amount of dough

I have bought 4 tins, and would like advice on how to work out how much flour and dough to put in.

First tin:

http://www.amazon.co.uk/Traditional-Farmhouse-Non-Stick-Lets-Cook/dp/B00CD0IUA2

I find 500g of flour will rise to the top and I have read 625g will let it bloom over and dome nicely. Even though it is meant to be a 3lb tin. I filled this with water and nearly 2000g.

Second tin:

http://www.amazon.co.uk/Extra-Large-capacity-Farmhouse-Loaves/dp/B009QZH3JQ

This I find needs 800-1000g, which is 200g off the 4lb it is meant to be. Should I use very strong flour with a loaf this big and how long should I bake it for as I am struggling to find recipes for bread this large. I filled this with water and it is 2400g.

Third tin:

http://bakerybits.co.uk/2lb-or-900g-seamless-aluminium-loaf-tin.html

The sides are far too short! Well at least I think so. I've used 500g of flour for this one and it doesn't do very much. I bought this based on Paul Hollywood's recommendation that bakery bits do a proper 2lb tin and he named dimensions which matched this one.

Tin number 4:

https://creedsdirect.co.uk/item/359/Bread-Tin-800g--Sandwich-T3056

I thought my problem was i needed a tin with straight sides and more sandwich like. So I got this. I put 500g of flour thinking it would make 800g loaf as the tin is labled and it hasn't got the size I would expect, barely 3/4 of the tin. I filled it with water and weighed and it was roughly 2400g.