I have been doing laser mining at overlapping Painite Hotspots in my Cutter recently. It is very very lucrative and is a perfect way to mine in a larger ship (the larger the better). I don't bother looking for cores at all.
Cutter outfit:
512 tons of cargo
4 x class 2 mining lasers
12 collector limpets
2 prospector limpets
The one thing I might do is to switch to mining lances (once unlocked) on the 2 wider hard points that are further back as they will have better range that more closely matches the range of the 2 medium mining lasers that I have up front.
I am able to mine 512t of Painite in about 2-2.5 hours. 400MCr profit. Made 1.2BCr this weekend, the start of my Fleet Carrier fund.