partial cycle results... is cycle too short?

[YourFace]

Hi there! I hope this post is helpfull for some and at the same time someone can help me.
my stats: 21yr old, first cycle, been training for 4-5 yrs, Im 188cm (abut 6ft, 2in), im from costa rica so sorry for my english.

im in the middle of this cycle (results are up to date):

WEEK Dbol /day Deca nolvadex /day Weigth(Kg) %fat
08-jul 1 30mg 400mg 10mg ................76,1.....9,9
15-jul 2 30mg 400mg 10mg ................79,7.....8,5
22-jul 3 30mg 200mg 10mg ................82,4.....9,3
29-jul 4 30mg 400mg 10mg ................82,4.....9,9
05-ago 5 ......200mg 10mg
12-ago 6 ................20mg
19-ago 7 ................20mg
26-ago 8 ................10mg
note: im in week 4, first day, in week 3 I couldnt take the second deca shot thats why it says 200mg but it was not planned. so im taking that extra shot on week 5
dosages:
Dbol: 10mg morning, 10mg mid day, 10mg night
Deca: 200mg tuesday afternoon, 200mg friday afternoon

nutrition: following a nutrition plan with an expert, 5 meals/day, lots of carbs and protein, nutrition is good (expert is supervsing).

training: 4-5 times a week (generally afternoon), (rest on weekends), avarage 1.5hr of lifting

QUESTIONS:
1) i´ve had some good gains specialy in the first week (8pounds), but it seemed to slow down in week 3. do you think it was because I couldnt inject the 2nd deca shot?, or what could it have been?

2) do you think this cycle is too short? I´ve been told that by some people but some others say its ok. If you suggest I could make it longer, how longer?, what substances?, what dosages? and why? (please keep in mind I want to make the cycle as short as possible while still having good gains and not "wasting my money")

THANKS