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Read my answer towards zero and i'll add. Right now, in their current state, the 3 PTRS is not good enough in order to deal with either the Flak HT nor the FHT. Not my words, everyone who played the preview patch. Inconclusive against P2 after they buff their performance against cover.
Flak HT and FHT are AI vehicles why should an AT infatry be able to deal with them to begin with?
Bazooka RE, Piat Ro.E and Tank hunter Tommies all face similar issues and I do not see the reason why PTRS Penal should be an exception.
In addition if you load PTRS Penal in vehicle the probably can deal with both vehicles.
The thing with PTRS in that in current implementation it always hits light vehicles.
That's the reason i also want to nerf the AT satchel, increase their cost, nerf their AI and nerf their cooldown. So the PENAL PTRS closes the gap to zooks, with a better performance against lights but worst against heavier vehicles. The burst dmg remains comparable.
I totally agree with removing the engine damage from satchel since they should have a tool to deter vehicles from pushing them around but they do not need to cause engine damage with a single snare.
There are several problems with Penal and PTRS. If one makes the very good vs light vehicles one runs the risk of making the Penal/sniper combo too strong.
In addition the fact that the unit start with superior AI and can then transit to AT make the unit too versatile and can create blobbing issue. If one wants there properties from singe unit one should probably follow the PF model and allow 2 different paths, an AI upgrade and AT upgrade. Else one can "create" an dedicated AT infatry and be done with.