Just get rid of soviet sandbags and replace them with OKW and USA styled sandbags, like said before. Soviet sandbags look so dank anyway
They need the separate sandbag model because of their big squad sizes that can't fit properly behind usf/okw sandbags. But the conscript sandbag does need a stat-reduction so it's a bit less survivable. USF/OKW sandbags also need a small buff so they won't get blown up by a single tank shell all the time. 200-250 hp would probably be fine for all sandbags, and a decent target-size so you can destroy them with AT guns.
All sandbags and barbed wire also need a stat reduction while under construction so you can't delay enemy units a whole lot by ghosting off choke points. Something like unfinished barbed wire takes 2 squads quite a few seconds to destroy.