If you are flying at blue line on your ASI on anything other than an ISA day at MAUW you are flying too fast and will not get the best rate of climb.
You should really calculate the new blue line speed before you go as part of your perf calcs. It can be as much as 10% different.
eg
MAUW = 3000lb and Vyse = 88kts
Actual wt = 2000lb
new Vyse = Old Vyse x sqroot(Actual wt/MAUW)
new Vyse = 88 x sqrt (2000/3000)
new Vyse = 88 x 0.8
new Vyse = 71kts
so if you fly at 88kt you have speed in hand therefore climb rate in hand