I bought 4 packs of GP 3300's back in February from World Class.
I also use a LRP Pulsar charger in the same manner that you do.
Charge @ 5 amps w/ 10mv cutoff for 6 cell packs.
After the race I discharge them @ 30 amps to 5.4 volt cutoff.
I let them cool before I put them away for next week.
When I get to the track for the next week, I discharge them on my LRP @ 10 amps with there 5.4 cutoff.
Then I let them rest a little while before I charge them to race.
I've notice a small increase in my mah reading in the packs.
They range from 3400 to 3500 in one case.
If you go to the LRP site, they give examples of what there team drivers use for charging GP 3300's.
Which is the example I used above.
I have never false peaked on any pack done like this.
And I'm not losing any HP in stock this way.
I am not using any trays either.
Hope this helps.