The first number is eccentric, second number is pause at the end of eccentric, third number is concentric, fourth number is pause at the end of eccentric.
I suggest you stick to 4010 for now, slow lowering but fast lifting.
I must say that most personal trainers are a joke, although there are 1 or 2 decent ones (they are the rare minority).
Just a short story - I used to go to FF at Manulife, but now I go to a different branch. Anyway one day I was doing face pulls, when this a$$hat trainer comes up to me and tells me that the ropes are for tricep pushdowns. I politely explain to him that I was doing face pulls, he gave me a blank look, so I decided to screw him even deeper by purposely using big words such as
scapular retraction. His reaction was 'wow new concept, cool cool'. Few months later, I was deadlifting. Same trainer comes over and tells me that deadlifting is not good, and that I should do Romanian Deadlifts instead. I was too tired to even say anything.
Anyway when I went to another branch, I befriended a trainer who is very good. He might not be the most knowledgeable, but he's always asking me to explain certain stuff that he sees me do, and the discussions are very interesting, I learn from him and he learns from me. His clients consistently get results, I see a lot of changes in less than 3 months.
So guess what, one day he asked me if I trained at any other FF branches, then I told him I used to train at ManuLife and about the a$$hat trainer there. Turns out mr A$$hat is the BEST SELLING PERSONAL TRAINER IN THE ENTIRE OF MALAYSIA. From the time I spent at ManuLife, all I can say is that he is more about 'entertaining' than training, his clients constantly talk and laugh DURING sets, so go figure.
Damn PTs