Quote from mcgene4xpro:
What are the tactics you will use to prevent brokers?
No one has answered the OP's question yet.
To the OP:
The only way I know how to do this, is to trade your way out of Retail Hell, and then move to a real institutional platform. If the platform is truly institutional, it will offer the Iceberg Order Type, along with several other Order Types, to help you conceal your true position size, timing, and critical execution levels.
Here is a good place to start learning about it:
http://vcapfx.com/
If you don't want to use an EA (many people don't like them) and you are still in Retail Hell with no other alternative to trade on an Institutional Platfrom, then the only other viable option I know of, would be to find a Retail trading platform similar to ProTader, or something that will enable you to connect to multiple brokers through the same platform, and that enables you to build your own Currency Instrument to trade.
With this strategy, you can do a couple of things:
a) Distribute your margin across multiple Retail FX Brokers/Intermediaries.
b) Correctly match-up margin account types: $1k, $10k and $100k accordingly.
c) Create a single trading strategy to be executed across one or more of your FX accounts, using a custom index that you create containing only the currency pairs that want to trade - as just one idea.
When you submit a Pending Order this way, your broker cannot see it. I'm not quite sure if NinjaTrader also allows for this, but I'm sure that somebody with NinjaTrader experience can jump in from here.
Of course, you can always go the Excel/MT4 route with FXDialogue's Mexel Trader, where all of your trades are executed from within Excel, against your Retail MT4 account - of course, you have to learn how to use Excel.
Other than that, you are just going to have to pull yourself out of Retail Hell, or fund your way out of Retail Hell. Either way, you've got to get out of Retail Hell, as soon as practicable.
If you can go Institutional right now, I would always recommend the FXAll Trading Platform (you can see it from the link I provide above). If you are not planning a hedge fund and you don't want the hassles of Retail Hell, the FXAll is simply the place to be right now using a Prime Brokerage account.
There's one last option. You can also use Barclays BARX Trading Platform (this is also what I use). You'll need about $300k minimum to start, and you can also use Excel to place your orders through the platform. You can also execute on FX Vanilla Options as well, so you have a bigger range of flexibility when it comes to creating Defensive Trading Strategies. When coming in through Excel, your orders will be hidden as well.
Your concerns are very valid and I hope this helps a bit.