Top toasting tip, always preheat the toaster.
Most of the issues come from the fact the toaster is cold..
So just pop it on for a quick heat up before you start, it fixes most of the issues, poor consistency (the element is probably getting hotter in some places than others far more quickly, easy to check if you pop it on with no bread in, on mine its really clear some areas are glowing red hot waaay before others.
First slices are ok or undercooked then following slices are overcooked or right if the first were undercooked, perfect example of how the lack of pre heating means the lack of consistency from the first round to the later rounds, now the toaster is hot it cooks faster.
If your slices are too big, very common problem, just cut them in half. Yes it reduces your capacity but it means far better toast as instead of hanging out or being forced in, you have loads of space to get it in right
try it, you will be really surprised the simple difference pre heating makes, if you think about it most cooking specifies pre heat oven, pre heat grill etc
