While you are clear that it is an EV-game and that you seem to play for entertainment, you don't seem to be very clear about the variance.
There are times I am dropping 200-400 $ balls so I get to wager alot, but seems like everytime I drop a big ball I hits a loss spot.
This is probably due to pure and simple variance, regardless of the strategy you use.
The average hitting ratio for 1000x is on every 32k drops but there are seeds that can go over 100k nonce without single 1000x.
My strategy for the long-term roll is in the high-risk line, 5k bets, and double up until it hit x999. The odds on that multiplier are 0.0034% so, in theory, you need close to 30k bets to hit it, and since not all the other 30k bets represent a loss then sometimes works fine for the long run.
Probabilities are not distributed equally among all spots. Spots on the far right and left are less likely to be reached than the ones of the middle. So I think the better strategy is to write down the result of each draw of the plinko you are playing in order to evaluate the real probability of each spot to be reached.
Good comments and analysis. What I don't see the logic of is getting into complicated calculations to play EV-, i.e. calculating the EV of losing money. Gamble for entertainment, yes. Be aware that it is a long term losing game, too. Now, studying and doing complicated calculations for plinkoI don't see it, for that I would do that study and those calculations in something that gives me profit, like some investment or bets with potential profit.