Just upgraded the 3/8" hose to 1/2" hose WOW!!!!!!!!!! What a difference.
After probably over an hour on the phone with Hydro Tek, researching friction loss and the expert advice those on this forum provided, I now have both the PSI and GPM at the business end. Retail cost of the 500" of 1/2" hose, plus the 2 jumper hoses, and all the new Hansen SS plugs and couplers was almost $1800.00. Not going to divulge exactly how much money I got the distributor to accept, but I will say I spent way less than $500.00.
With 300' of 3/8", I was getting 2500 PSI. Now with 250' of 1/2" on each reel, I'm getting 3350 PSI and almost 9 GPM. The Hydro Twisters are really light and now they're almost hovercrafts. And using the water broom on my 2 ANT3C is now like pushing a Lear jet.
Hannay claims that 300' of 1/2" would fit on the reels I have. I doubted it, thus the reason I went with 250'. Good thing, cause there is no way 300' of 1/2" would fit.
Thanks again to those that offered their assistance and professional advice.