The Hecarim buffs aren't enough
Hecarim had it bad enough early game even with a Spirit Stone but now it's worse and the pitiful buffs you gave him this patch solve nothing.
You increased his W's healing cap by a marginal amount but it still has an extremely long cooldown and doesn't heal Hecarim enough early especially with the new jungle camps being so strong.
And as Hecarim is supposed to be a ganking jungler it's hard to do that when you take half your health clearing one camp early.
He doesn't clear quickly enough early, takes too much damage and doesn't heal enough. His W's CD is really long as I already mentioned and since you max your Q first for a long time the maximum healing you get is 90 every 22-18 seconds assuming you don't have any CDR.