Heli,
Spraying is not done at the high speeds you mentioned.
Generally speaking.....when spraying you are going to take what is just in front of you...and try to use what airspeed you have to add to your Rotor Inertia.
In the Sight Seeing photo.....or when over terrain that does not provide nice landing spots....seek the lowest, softest, smoothest, least wet place you can.
Fluffy short green Trees are softer than tall, dark ones.
Remember in forested areas...areas of new growth probably have old Stumps hidden by the new Trees. Aim for a trail or track where you can see there are no stumps.
Personally, I opt to keep my airspeed up, pick the best looking area in general, and when you get right down to the Decision Point....pick what looks the best....and try to arrive at the tree tops with as much Nr as you can and as little forward airspeed as you can....and use up all that Nr slowing your ROD to the minimum possible as you enter the Trees staying as level as possible or very slightly nose high.
Unless there is a "good" place that you can easily make....don't try for one and land short out of Nr. We live and die by Nr....or the lack of it.