Dennis, the 'rough idle' is very intermitent, in my truck. More times than not, the idle is very smooth. I'm not sure I can answer the question on wash down, though my last oil sample stated that the " insolubles ( oil oxidation and soot) improved tp 0. 4%, showing good oil filtration and complete combustion". Thats a quote from the Blackstone labs analysis on the last sample, which was taken at 3,000 miles, all of those miles were with the 5's. That being stated, I wouldn't plan on extended idle time, especially when it's cold outside, with the showerheads of any variety. All my idle time is spent with the ebrake on.
I never ran with the stage 2 injectors, but I had the 3's for a few months, along with the EZ. My EZ box is and always been set on the most aggressive jumper. I mention this in regards to your comment on the stage 2's and the EZ, stating that they smoked alot with low boost. I believe that the issue of smoke is very personal as to what you feel is okay for a daily driver. The smoke from the 3's and the EZ wasn't bad at all, for me. The smoke from the 5's and the EZ is controllable but considerably thicker with low boost. You really have to adjust your driving habits with the 5's as a daily driver. First off, there is no such thing as a smoke free start with the 5's ( at least with the EZ on the most aggressive setting). I usually start off in first, unless I'm stopped facing downhill, then I try to bring the rpms up in between shifts, winding out each gear so that no lower than 45 MPH when I hit 5th gear. This helps to control the smoke. If you are stopped at the bottom of a steep hill, you have two choices... 1) try to baby it and slowly build boost in between shifts, which equates to a everlasting wispy 'haze', or 2) hammer down and get to a good boost psi, which equates to short but very thick spouts of coal train smoke.
MC, the lopey sound of a overcammed gasser is only at idle, acceleration is very smooth, throttle response is the same as the 3's. Egt's over the 3's equal about 50-100 degrees hotter for me, where I pull a 17 % grade with the 3's at WOT, the egt's were around 1000 pre turbo, now I see about 1050-1100 on the same run. In fact, I just pulled that grade the other day with about 1200 lbs in the bed, saw 1150 at WOT for the short run to the top. This was with the EZ, the TST was off. As too the EZ, and this is just my perception and maybe incorrect, I don't think that the showerheads and the EZ alone are taxing that VP44 too much. I believe that you are putting a larger strain on the injection pump by trying to reach large numbers with a hot electronic box that taxes the duty cycle of the pumps solenoid with the smaller injectors. Please, someone correct me if I'm wrong, just my take. We all know that the EZ box is a very mild fueler, my theory is that the addition of the large injectors with the EZ are much less taxing, that's why I save the TST for recreational purposes only

. Bottom line is that I am VERY happy with the power output with just the 5's and the ez as a daily driver, it has satisfied me for over 6 months now and I have no plans for anything other than a NOS kit in my future, again, for play only (actually, I just want one of those cool NOS decals for my back window

). I think you know the answer to your question on the turbo. I'm not sure which one you have (HX35 12 cm ??) but I'm pretty sure that the egt's would be high. If you have the extra $$$, just do it right and put in a larger turbo now, IMHO. Fuel pressure... Make sure that you have no restrictions and good psi's at idle and WOT now, before the install of the showerheads. With mine set at 12 psi's post filter @ idle, I can drag it down to 6 psi's for an instant and then it usually goes back up to 8 psi's, though it has a tendancy to hover around 5-6 psi's with the TST box also on and set on 'KILL'. Keep in mind also that my lift pump is the Mallory 4150, more output than the stock Carter pump so if your using a Carter, you will probably see more of a psi drop at WOT, again, just my opinion but I believe that the Carter is rated at 70 GPH compared to the Mallory's 140 GPH. I'm not sure how much this really comes into play when the OEM fuel filter only flows at 40 GPH (???) and I'm not telling you to swap out to a Mallory, as they (and I) have had failures with this pump as well. If your running a Carter and the psi's are good, try it and if it sucks the psi's down to zero, upgrade it.
Scott W.