yea too much test will just start to fight the collagen synthesis that nandrolone and boldenone potentiate. I think that your cycle needs to be re-thought. I do not mean any offense But i think that there is more to it than gear if you really want to add a moderate amount of LBM and then cut fat weight and drop water in one cycle(even in 15 weeks). the compounds you are using take a long time to kick in for one thing. Superdrol is poison IMO, and clenbuterol isnt necessarily heart healthy. I think that you may want to consider NOT using superdrol. Lets give ourselves 15 weeks to work with for conversation sake:
weeks 1-2: front-load test enanthate at twice the dose for the first two weeks, whilst kicking off with a bit of prop and some dbol (one, the other, or both). that way you arent wasting time. after the two weeks you can drop the test prop, and continue on the dbol until about week 4-5. at this point you should have enanthate in full swing.
so then:
weeks 1-10: nandrolone deconate (or maybe consider boldenone. Minus the hunger, it is a clean, safe compound that is also good for joints)-nandrolone is more anabolic though....
if you have experience with clenbuterol and it treats you well then go ahead and use that. If not consider ECA+androgen assisted morning cardio, lots of BCAA's and stuff like DCP, sesamin, and a carb cycling diet. Using a very anabolic compound like nandrolone will assist you in holding on to your LBM gains. I think to really accomplish your goal, your diet it going to be #1 priority. In order to put on as much LBM as possible before cutting you can consider 'priming' before this cycle with a bit of carb cycling (this way you can perfect it for yourself before doing it when you cut). with Test and dbol you should blow right up (obviously some water too but use an AI!, Have tamox on hand but an AI would probably be better for you IMO). then you can just ride out the test and the nandrolone until about the mid-way point when you can begin to carb cycle while incorporating the cut-assist compounds mentioned above. If you want to use something like superdrol (depending how you react to it) use it to book end your cycle as the esters clear. if you dont want to use an oral, then prop or test suspension can work with an AI, but may not be ideal since you wanna finish being as dry as possible (superdrol is good for this).
you could always just ride out the esters with no form of bookend>....
btw I dont know your thoughts on tren but it is so anabolic and androgenic that some people report making LBM gains whilst dropping fat.