Monday - Back / Bicepts

This week I have confused my body again.
I am doing 2 muscle groups per workout, 2 excersizes per muscle, 4-8 reps heavy weight with 1 warm up set per muscle.
Monday I did back/bicepts - This is what I THINK I did, I dont write it down. Maybe i should start.
I did a few chinups/pullups for fun... to see how many I could do (I did 2 and a half..... I used to be able to do 10)
Then I did warmup lat pulldowns, 20 @ 85 pounds.
8 @ 120
6 @ 140
4.5 @ 160
Then I did seated hammer row.
20 @ 1 Plate (per side) - had not done them in a While and not sure how much I could lift
12 @ 1.5 Plates (again I was not sure how much I could lift)
12 @ 2 Plates
8 @ 2.5 Plates
6 @ 3 Plates
Then I did bicepts.
Put a Dime on the Olympic bar (45 pound straight bar)
Pulled up 12
8 @ 15 (Dime & Nickle per side)
6 @ 20 (2 Dimes per side)
4 @ 25 - My forearms were killing me more than my bicepts!
Then Concentration Curls
I was confused and Thought I could lift more now... Pulled the 40's and did like 2 per side.
Went to 35's and did like 4 per side.
Then 30's and did 3 sets of 5-6 per side.
Stood up did hammer curls 4 times per side and dropped them ate my shake.