Quite a promising patch, fixes a lot of issues with OKW and some others too. However I have a problem with it:
The infantry section nerf is probably heavier than relic realizes (vet nerf is fine though), since they have next to no cooldown (most of the time between shots is winddown). This means that decreasing the out-of-cover penalty barely does anything (0.2 DPS at close range), while the other nerfs are massive. Playtesting IS (4 man) vs Grens:
-IS is slightly better than grens out of cover
-IS is better when both in cover
-IS is worse than lmg grens out of cover
-IS is slightly worse than lmg grens when both in cover
The biggest offender is lmg grens actually winning when both are in cover. This makes infantry sections obsolete without 5 man upgrade or brens since they don't have the utility of grens or the fighting power of riflemen. The changes need to be reverted except vet nerf.
The problem here is that you're pitting an upgraded squad vs a non-upgraded squad. One side is always going to have an advantage when something has been invested in them.
Infantry sections might not have all the utility of grens but they still pack quite a punch.