look again andy.......the first turbo is only running a 53.86 turbine wheel with a 76 trim , thats about the same size your running now
but this has a bigger trim ,so should flow a lot better,aided by a 11 billet blade compressor wheel for maxium airflow, your piss poor turbine is about the same size, but with a much smaller trim , ie your exhaust gases are backing up /reversion/choking your engine, as it cant get rid of the gases quick enough top end, hence your not getting the magic 230 bhp you keep asking /trying to get
you have to purchase the ar turbine housing yourself(exhaust side) prob a .63 in your case.
the second turbo is running a 56mm turbine wheel , hardly world shattering sizes here....
again you can choose your own ar turbine housing, this maybe a bit bigger laggier than your use to, but you did say rosses was about this size, so please dont **** yourself, if you want bigger whp then you need to pump more air, the turbo is the pump
the bigger the turbo the more you flow ,the more you get at expense of lag, but as i said both of the above are well within your limits, the turbo logg mentioned had a 58mm turbine, which is bigger than both of the above i mentioned
you think my turbo's big ... it will prob push around 450 maybe absolute max 500bhp on my engine, without pushing stupid boost and stupidly high air intake temps, to put things into prospective for you
also a certain very high powered c1j , was running the same turbo as mine, probabley with a smaller ar. turbine housing, and lot of other mods and managed 405bhp before hitting the wall so to speak, so in relation, the turbo's ive mentioned are well within your scope, stop ****ing around with everything else on your engine, and change the one thing that has been repeated to you, over and over ,for the past 12 months