Zolga....it's a fine card, but as long as you can keep REDMD on the field, you'll never need to Tribute Summon the stronger dragons, rendering Zolga almost useless, unless you really need that LP gain.
If you just want monsters as Tribute to SS GEPD, don't use Photon Leo. You can't get it into the field quickly, since your Deck isn't revolving around GEPD, also, Leo itself is a Beast, while all your cards that facilitates quick SS-ing, like REDMD and Flute, only SS Dragons. REDMD can also SS GEPD if you want to.
And I'm sure you should already know this, you don't even need to use Photon monsters as Tribute, GEPD only needs any monster with 2000+ ATK. So for the Tributes you can use Cyber Dragon, Rabidragon, Wattaildragon, or even BEWD. Basically, you don't need Leo because you already have enough fodder for GEPD. Tributing other Dragons are good if you need some Dragons in the Graveyard for Dragon's Mirror.....which I just noticed is not in your Deck. Dragon's Mirror is useful for Dragon decks since it lets you Fusion Summon your Five-Headed Dragon using materials from the Graveyard.
.....and drawing LV7 but not having LV5 is one of the problems I'm talking about, so yes, you did have the problem I brought up