Heavy duty or not. Bilstein HD or TOURING

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A question on shocks. I`m ordering the heavy duty overload IPD springs (REAR) for the 740 wagon,... also thinking at this point about adding new shocks too (rear).
I`m thinking now,... like,... which option is a better match for the ipd HeavyDuty springs?

a, bilstein heavy duty shocks or
b, bilstein `touring` shocks

Any real experience, anyone? I`d need to hear opinions asap.
I appreciate the feedback. Would it be a stupid couple to have bilstein Touring rear shocks WITH the heavy duty ipd springs?
OR Is it better to have hd shocks WITH hd springs? Thanks

Ps.I have new Bilstein Touring-s at FRONT, not hd, but so far no complaints, very nice ride. I`m not using wagon for extremely heavy stuff. 200lbs 125cc dirtbike doesnt affect anything , but the 450 dirt is appr 300lbs on the factory volvo hitch, on an aluminium carrier/ramp that has weight to it too (~70lbs)
When loaded, rear is down like 5cm/2inches min. When bike is on, it is worse. Looks ugly. new front bilsteins are great but rear went down a bit after I installed them (front).
Recently thinking about hd overload springs all times. What shocks would u match with ipd hd springs? BILSTEINS strongly preferred here.

I just want to be safe(r), not look that saggy anymore, and/but have a stronger rear setup... BUT not a crazy thing to shake my leftover teeth out! I really dont want a harsh ride, i dont like sacrificing too much ride comfort. I always hated all our EU overload susp ford escort wagons that made so much noise on regular bumps... IPD didn`t answer my email today. (I have their front-rear anti sway installed btw)
So:

Q #1. HD shocks OR TOURING shocks to buy? (is Bilstein Touring a nice one with HD springs?)
Q #2. What (how much in cm-s) is considered a `normal` gap size at front fender? I currently have the 16 inch Hydras with 205/55 tires. and big fender-gap but hey stop thinking!... i`m not ordering their lowering kit springs