Please check the answer to your various queries in blue above, first.
Let me tell you the basic difference between RKSV and Zerodha charges.
RKSV asks for an upfront payment of 1947 INR per month (no more brokerage) plus other statutory charges like service tax, STT etc. etc. And you can do unlimited equity and F&O, no extra brokerage will be charged but other charges will be applicable as per rules. The 1947 INR, you can say, is total brokerage per month but this amount is not inclusive of all other charges, which will be extra.
While Zerodha is not charging any monthly charges but charges 20 INR per trade (one leg only either buy or sell) and in one trade you can trade as much as you can, no limit. 1 lot, 10 lots, 1000 lots. 100 shares, 10000 shares, no limit but other statutory charges will be charged extra. One trade is either buy or sell and not both at a time. Buy and sell will be counted as two trades.
You must understand the other charges factor, the total of these other charges is not a small amount for future trading. For 1 lot nifty future while the brokerage will be 40 INR {20 (for buy) + 20 (for sell)}other charges will be about 130-140 which will be charged extra both by zerodha and by RKSV as well. It is not that RKSV will not charge these other charges extra.
However for options the other charges factor will be much smaller as compared to future trading. For example yesterday I sold a few lots of options in 3 trades, total value 95430 INR and paid 179 as other charges including 60 as brokerage, 77 as turnover charges and 17 each as STT and service tax)
While zerodha charges some higher turnover charges, the turnover charges of RKSV is on the lower side. The difference is perhaps 200 -250 INR per crore. You can check it from their websites.
The stamp charges with zerodha is 0.01% or 50 INR per contract note (of the total trades of the day) whichever is lower. That mean zerodha will charge maximum 50 INR as stamp charges. While RKSV charges a fix stamp duty (check their website), no maximum like zerodha.
For more details you can visit their websites and use their brokerage calculators. Even in traderji forum both have their threads, so you can get review or other information from these threads also.
I think, if you suppose to do more than 90-95 trades (buy/sell) per month (20 trading days on an average), then choose RKSV otherwise zerodha. Its your choice.
I hope I answered your queries, if any one remains, do post here and will try to answer.