Prowell H20 what works best 1 or 2 applications?

I have been using prowell H20 the past few years on my hybrid Bermuda fields at a rate of 1 gallon a acre mixed with glyphosate before green up ln ate February here. Overall it has worked ok but I still have some issues with crabgrass and signal grass so I was thinking about trying 2 applications this year the 1st like always but using 2 quarts a acre mixed with glyphosate and then weight about a mount or so and do a 2nd application of 2 quarts a acre and see if I get better results. What has worked best for you guys using it?

Prowell H20 what works best 1 or 2 applications?