My Maha 2nd bloom causes some concern due to heavy fruiting
(see pic). Should I thin out some?

Concern is due to heavy fruiting.... So the guess is your concerned about the weight of the fruit possibly causing llimbs to break.....
The problem is a poor picture of the limb base and angle of bend and how much it has bent to possibly answer your question to your particular tree.... The shot up in the air does nothing to show the base of the branch nor the angle from the trunk...
All I can hellp you with is to tell you that if you have high winds hitting the tree limbs, there will probably be a high chance of limb loss and 20+ mangos falling with the limb or limbs....
I had winds about 2 weeks ago and a large limb in good shape coming off the trunk at about a 135 degree from ground angle holding about 30 to 40 maha's fell off the tree separating cleanly at the trunk.... So if your limb is bending... consider reducing weight if winds are expected.... unless you like to roll the dice...