The P&P ECUS as a rule run rich. Some people say those ECUs also prefer stock injectors, as stock injectors are good for 1bar TD04 builds you might aswell just keep them. As for a FPR, quite a lot of people keep them stock. Imo theres no point buying one unless you can monitor the results the adjustments make, ie on a dyno or with a wideband. Ad say bang the boost up to a bar and enjoy.