Hey
While this is broken down into 76 attempts it means you do join 350 ph/s for 76 times. 4 hours x 76 which is 304 hours or 12.6 days of 350 phs not 30 minutes or so.
alas, this doesn't change the general equation when risk/reward is tasked into account, you seem to be ignoring two critical parts:
1- Your share of that 350PH is very small.
2- The chances of those 350PH hitting a block anyway is 1 in 1,122.
Let's look at it from a different point of you, you are going to participate in 76 runs with 350PH each, lasts for 4 hours, that is the equivalent of 26,600PH running for 4 hours straight, your average 100% luck would get you 1.73 blocks or 10.8
BTC.
Now let's calculate the total cost of that 350 package so we can get the number of shares in each run , the average price per PH on nice hash is 0.00267 btc / day, so 4 hours for 350PH would be 0.00267/24*350*4 = 0.15575
BTC if each share is 0.0001 then the total shares must be 1,557 shares
Your total shares are 333, the total other shares will be at least 1,557 * 76 = 118,332, and your % of those shares is 0.281% or 0.030348
BTC (less than the initial 0.0333 BTC you paid).
Of course, this assumes 100% luck, if your luck is 50% you get double that if it's 200% you get half, so with the 25% fees, this is an overall terrible strategy.
With this approach you are more like pool mining than solo mining, you are joining a large force that has a high chance of winning while your share of that potential reward is pretty small, this goes against the solo mining runs that other folks run, I am not sure if you understand this, but while you have greatly reduced the risk (you will unlikely get out without any payment with this strategy) you have also drastically reduced your potential rewards.
In reality, with the fees that nicehash will get from you, if you run your strategy against infinity you will end up losing money no matter what, of course, you get 25% it's a good deal, but for everyone else, they will certainly lose money in the long run, there is no doubt about it for anyone who understands how mining really works.
I do believe that we may have a slight difference from our point of view as I came from trading nasdaq and others to crypto so I have some experience creating strategies and I am trying to combine my experience here and there together. Maybe this is the reason I am leaning more to my plan but yeah
There is a huge difference between trading and attempting to "break luck", one is proven to work, another is scientifically proven NOT to work, there is no way to solve luck, luck is random.
See I really have no issue with you trying to experiment whatever you want, after all, it's your money, but the people who join the runs should be aware that the math states that they will end up losing money using this strategy with 25% fees.
Good luck.