The difference between the amount of tries you get and the percentages mean that you have to be very lucky to proceed. Not really constructive for an online game where there are thousands of other choices to use during the time we play this.
Players wait months to build up enough for a few goes and often are the same level or lower than when they started. Players then realise there is no point to trying.
If you try now you have either had too much to drink or you think you have a special time or a certain wait before the next. Again not impressive for a game with all the choices available.
Here is my suggestion- every 7 days all percentage chances raise 5 percent.
If you attempt any then all the chances should go back to default.
This means you have a choice try and succeed or fail OR you can wait for the one you are trying for to get to 100 percent with full amount of cells used and you are guaranteed an increase.
After you pressed it resets to default and it all starts again.
Also older experimental and normal ones once they are over 4 yrs old the amount needed drops by 50 percent
Finally when 90% of the players in the game has an upgrade that upgrade is taken out of the game or the upgrade is over 6 yrs old.
The reason for the last bit is that we can stabilise the barrier to entry for older players and every 2 yrs a new one can be brought in to keep income for the company and something for players to collect.